diff --git a/src/UglyToad.PdfPig/Graphics/Operations/CloseAndStrokePath.cs b/src/UglyToad.PdfPig/Graphics/Operations/CloseAndStrokePath.cs
index 6c440852..0503f734 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/CloseAndStrokePath.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/CloseAndStrokePath.cs
@@ -3,29 +3,42 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Close and stroke the path.
+    /// </summary>
     internal class CloseAndStrokePath : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "s";
 
+        /// <summary>
+        /// The instance of the <see cref="CloseAndStrokePath"/> operation.
+        /// </summary>
         public static readonly CloseAndStrokePath Value = new CloseAndStrokePath();
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
         private CloseAndStrokePath()
         {
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
             operationContext.StrokePath(true);
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
             stream.WriteText(Symbol);
             stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return Symbol;
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/CloseFillPathEvenOddRuleAndStroke.cs b/src/UglyToad.PdfPig/Graphics/Operations/CloseFillPathEvenOddRuleAndStroke.cs
index db2c8d8b..94c0debc 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/CloseFillPathEvenOddRuleAndStroke.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/CloseFillPathEvenOddRuleAndStroke.cs
@@ -3,27 +3,41 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Close, fill, and then stroke the path, using the even-odd rule to determine the region to fill.
+    /// </summary>
     internal class CloseFillPathEvenOddRuleAndStroke : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "b*";
 
+        /// <summary>
+        /// The instance of the <see cref="CloseFillPathEvenOddRuleAndStroke"/> operation.
+        /// </summary>
         public static readonly CloseFillPathEvenOddRuleAndStroke Value = new CloseFillPathEvenOddRuleAndStroke();
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
         private CloseFillPathEvenOddRuleAndStroke()
         {
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return Symbol;
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/CloseFillPathNonZeroWindingAndStroke.cs b/src/UglyToad.PdfPig/Graphics/Operations/CloseFillPathNonZeroWindingAndStroke.cs
index f6dfbdc6..2d6d1f55 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/CloseFillPathNonZeroWindingAndStroke.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/CloseFillPathNonZeroWindingAndStroke.cs
@@ -3,27 +3,41 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Close, fill, and then stroke the path, using the nonzero winding number rule to determine the region to fill. 
+    /// </summary>
     internal class CloseFillPathNonZeroWindingAndStroke : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "b";
-
+        
+        /// <summary>
+        /// The instance of the <see cref="CloseFillPathNonZeroWindingAndStroke"/> operation.
+        /// </summary>
         public static readonly CloseFillPathNonZeroWindingAndStroke Value = new CloseFillPathNonZeroWindingAndStroke();
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
         private CloseFillPathNonZeroWindingAndStroke()
         {
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return Symbol;
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/FillPathEvenOddRule.cs b/src/UglyToad.PdfPig/Graphics/Operations/FillPathEvenOddRule.cs
index c4e33de3..d9286de6 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/FillPathEvenOddRule.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/FillPathEvenOddRule.cs
@@ -3,27 +3,41 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Fill the path, using the even-odd rule to determine the region to fill.
+    /// </summary>
     internal class FillPathEvenOddRule : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "f*";
 
+        /// <summary>
+        /// The instance of the <see cref="FillPathEvenOddRule"/> operation.
+        /// </summary>
         public static readonly FillPathEvenOddRule Value = new FillPathEvenOddRule();
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
         private FillPathEvenOddRule()
         {
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return Symbol;
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/FillPathEvenOddRuleAndStroke.cs b/src/UglyToad.PdfPig/Graphics/Operations/FillPathEvenOddRuleAndStroke.cs
index c86fb06b..dcd974fe 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/FillPathEvenOddRuleAndStroke.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/FillPathEvenOddRuleAndStroke.cs
@@ -3,27 +3,41 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Fill and then stroke the path, using the even-odd rule to determine the region to fill.
+    /// </summary>
     internal class FillPathEvenOddRuleAndStroke : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "B*";
 
+        /// <summary>
+        /// The instance of the <see cref="FillPathEvenOddRuleAndStroke"/> operation.
+        /// </summary>
         public static readonly FillPathEvenOddRuleAndStroke Value = new FillPathEvenOddRuleAndStroke();
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
         private FillPathEvenOddRuleAndStroke()
         {
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return Symbol;
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWinding.cs b/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWinding.cs
index aa6731f0..27bf8de9 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWinding.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWinding.cs
@@ -3,27 +3,42 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Fill the path, using the nonzero winding number rule to determine the region to fill. 
+    /// Any subpaths that are open are implicitly closed before being filled.
+    /// </summary>
     internal class FillPathNonZeroWinding : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "f";
 
+        /// <summary>
+        /// The instance of the <see cref="FillPathNonZeroWinding"/> operation.
+        /// </summary>
         public static readonly FillPathNonZeroWinding Value = new FillPathNonZeroWinding();
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
         private FillPathNonZeroWinding()
         {
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return Symbol;
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWindingAndStroke.cs b/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWindingAndStroke.cs
index 1ce7d630..ef6d9abc 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWindingAndStroke.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWindingAndStroke.cs
@@ -3,27 +3,41 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Fill and then stroke the path, using the nonzero winding number rule to determine the region to fill.
+    /// </summary>
     internal class FillPathNonZeroWindingAndStroke : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "B";
 
+        /// <summary>
+        /// The instance of the <see cref="FillPathNonZeroWindingAndStroke"/> operation.
+        /// </summary>
         public static readonly FillPathNonZeroWindingAndStroke Value = new FillPathNonZeroWindingAndStroke();
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
         private FillPathNonZeroWindingAndStroke()
         {
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return Symbol;
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWindingCompatibility.cs b/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWindingCompatibility.cs
index ee9bcffb..0a8f1959 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWindingCompatibility.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/FillPathNonZeroWindingCompatibility.cs
@@ -3,27 +3,42 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Equivalent to <see cref="FillPathNonZeroWinding"/> included only for compatibility. 
+    /// Although PDF consumer applications must be able to accept this operator, PDF producer applications should use <see cref="FillPathNonZeroWinding"/> instead.
+    /// </summary>
     internal class FillPathNonZeroWindingCompatibility : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "F";
 
+        /// <summary>
+        /// The instance of the <see cref="FillPathEvenOddRuleAndStroke"/> operation.
+        /// </summary>
         public static readonly FillPathNonZeroWindingCompatibility Value = new FillPathNonZeroWindingCompatibility();
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
         private FillPathNonZeroWindingCompatibility()
         {
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return Symbol;
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/InvokeNamedXObject.cs b/src/UglyToad.PdfPig/Graphics/Operations/InvokeNamedXObject.cs
index 6f63ed90..522c4a3f 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/InvokeNamedXObject.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/InvokeNamedXObject.cs
@@ -4,19 +4,37 @@
     using Content;
     using Tokens;
 
+    /// <summary>
+    /// Paint the specified XObject. 
+    /// The operand name must appear as a key in the XObject subdictionary of the current resource dictionary. 
+    /// The associated value must be a stream whose Type entry, if present, is XObject.
+    /// The effect of <see cref="InvokeNamedXObject"/> depends on the value of the XObject's Subtype entry, which may be Image, Form or PS. 
+    /// </summary>
     internal class InvokeNamedXObject : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "Do";
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
+        /// <summary>
+        /// The name of the XObject which appears in the XObject subdictionary of the current resource dictionary.
+        /// </summary>
         public NameToken Name { get; }
 
+        /// <summary>
+        /// Create a new <see cref="InvokeNamedXObject"/>.
+        /// </summary>
+        /// <param name="name">The name of the XObject.</param>
         public InvokeNamedXObject(NameToken name)
         {
             Name = name;
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
             var xobject = resourceStore.GetXObject(Name);
@@ -24,11 +42,16 @@
             operationContext.ApplyXObject(xobject);
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteText($"/{Name}");
+            stream.WriteWhiteSpace();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return $"{Name} {Symbol}";
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceCmyk.cs b/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceCmyk.cs
index 9d6fde55..2264aac8 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceCmyk.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceCmyk.cs
@@ -3,20 +3,46 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Set the non-stroking color space to DeviceCMYK and set the color to use for stroking operations.
+    /// </summary>
     internal class SetNonStrokeColorDeviceCmyk : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "K";
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
+        /// <summary>
+        /// The cyan level between 0 and 1.
+        /// </summary>
         public decimal C { get; }
 
+        /// <summary>
+        /// The magenta level between 0 and 1.
+        /// </summary>
         public decimal M { get; }
 
+        /// <summary>
+        /// The yellow level between 0 and 1.
+        /// </summary>
         public decimal Y { get; }
 
+        /// <summary>
+        /// The key level between 0 and 1.
+        /// </summary>
         public decimal K { get; }
 
+        /// <summary>
+        /// Create a new <see cref="SetNonStrokeColorDeviceCmyk"/>.
+        /// </summary>
+        /// <param name="c">The cyan level.</param>
+        /// <param name="m">The magenta level.</param>
+        /// <param name="y">The yellow level.</param>
+        /// <param name="k">The key level.</param>
         public SetNonStrokeColorDeviceCmyk(decimal c, decimal m, decimal y, decimal k)
         {
             C = c;
@@ -25,15 +51,27 @@
             K = k;
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteDecimal(C);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(M);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(Y);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(K);
+            stream.WriteWhiteSpace();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return $"{C} {M} {Y} {K} {Symbol}";
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceGray.cs b/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceGray.cs
index e0b3332b..35a8f50b 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceGray.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceGray.cs
@@ -3,28 +3,45 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Set the gray level for non-stroking operations.
+    /// </summary>
     internal class SetNonStrokeColorDeviceGray : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "g";
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
+        /// <summary>
+        /// The gray level between 0 (black) and 1 (white).
+        /// </summary>
         public decimal Gray { get; }
 
+        /// <summary>
+        /// Create a new <see cref="SetNonStrokeColorDeviceGray"/>.
+        /// </summary>
+        /// <param name="gray">The gray level.</param>
         public SetNonStrokeColorDeviceGray(decimal gray)
         {
             Gray = gray;
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteNumberText(Gray, Symbol);
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return $"{Gray} {Symbol}";
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceRgb.cs b/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceRgb.cs
index 356bdbc0..184cd4b1 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceRgb.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceRgb.cs
@@ -3,18 +3,40 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Set RGB color for non-stroking operations.
+    /// </summary>
     internal class SetNonStrokeColorDeviceRgb : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "rg";
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
+        /// <summary>
+        /// The red level between 0 and 1.
+        /// </summary>
         public decimal R { get; }
 
+        /// <summary>
+        /// The green level between 0 and 1.
+        /// </summary>
         public decimal G { get; }
 
+        /// <summary>
+        /// The blue level between 0 and 1.
+        /// </summary>
         public decimal B { get; }
 
+        /// <summary>
+        /// Create a new <see cref="SetNonStrokeColorDeviceRgb"/>.
+        /// </summary>
+        /// <param name="r">The red level.</param>
+        /// <param name="g">The green level.</param>
+        /// <param name="b">The blue level.</param>
         public SetNonStrokeColorDeviceRgb(decimal r, decimal g, decimal b)
         {
             R = r;
@@ -22,10 +44,12 @@
             B = b;
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
             stream.WriteDecimal(R);
@@ -38,6 +62,7 @@
             stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return $"{R} {G} {B} {Symbol}";
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceCmyk.cs b/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceCmyk.cs
index de8db880..b64cf996 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceCmyk.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceCmyk.cs
@@ -3,20 +3,46 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Set the stroking color space to DeviceCMYK and set the color to use for stroking operations.
+    /// </summary>
     internal class SetStrokeColorDeviceCmyk : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "K";
-
+        
+        /// <inheritdoc />
         public string Operator => Symbol;
 
+        /// <summary>
+        /// The cyan level between 0 and 1.
+        /// </summary>
         public decimal C { get; }
 
+        /// <summary>
+        /// The magenta level between 0 and 1.
+        /// </summary>
         public decimal M { get; }
 
+        /// <summary>
+        /// The yellow level between 0 and 1.
+        /// </summary>
         public decimal Y { get; }
 
+        /// <summary>
+        /// The key level between 0 and 1.
+        /// </summary>
         public decimal K { get; }
 
+        /// <summary>
+        /// Create a new <see cref="SetStrokeColorDeviceCmyk"/>.
+        /// </summary>
+        /// <param name="c">The cyan level.</param>
+        /// <param name="m">The magenta level.</param>
+        /// <param name="y">The yellow level.</param>
+        /// <param name="k">The key level.</param>
         public SetStrokeColorDeviceCmyk(decimal c, decimal m, decimal y, decimal k)
         {
             C = c;
@@ -25,15 +51,27 @@
             K = k;
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteDecimal(C);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(M);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(Y);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(K);
+            stream.WriteWhiteSpace();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return $"{C} {M} {Y} {K} {Symbol}";
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceGray.cs b/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceGray.cs
index 63e2c352..aea58bc2 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceGray.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceGray.cs
@@ -8,6 +8,9 @@
     /// </summary>
     internal class SetStrokeColorDeviceGray : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "G";
 
         /// <inheritdoc />
@@ -35,10 +38,7 @@
         /// <inheritdoc />
         public void Write(Stream stream)
         {
-            stream.WriteDecimal(Gray);
-            stream.WriteWhiteSpace();
-            stream.WriteText(Symbol);
-            stream.WriteNewLine();
+            stream.WriteNumberText(Gray, Symbol);
         }
 
         /// <inheritdoc />
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceRgb.cs b/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceRgb.cs
index e353d828..7bfeeff9 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceRgb.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceRgb.cs
@@ -8,6 +8,9 @@
     /// </summary>
     internal class SetStrokeColorDeviceRgb : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "RG";
 
         /// <inheritdoc />
diff --git a/src/UglyToad.PdfPig/Graphics/Operations/TextShowing/MoveToNextLineShowText.cs b/src/UglyToad.PdfPig/Graphics/Operations/TextShowing/MoveToNextLineShowText.cs
index 979a00c8..33546963 100644
--- a/src/UglyToad.PdfPig/Graphics/Operations/TextShowing/MoveToNextLineShowText.cs
+++ b/src/UglyToad.PdfPig/Graphics/Operations/TextShowing/MoveToNextLineShowText.cs
@@ -1,32 +1,56 @@
 namespace UglyToad.PdfPig.Graphics.Operations.TextShowing
 {
+    using System;
     using System.IO;
+    using System.Linq;
     using Content;
     using TextPositioning;
     using Util.JetBrains.Annotations;
 
+    /// <summary>
+    /// Move to the next line and show a text string.
+    /// </summary>
     internal class MoveToNextLineShowText : IGraphicsStateOperation
     {
+        /// <summary>
+        /// The symbol for this operation in a stream.
+        /// </summary>
         public const string Symbol = "'";
 
+        /// <inheritdoc />
         public string Operator => Symbol;
 
+        /// <summary>
+        /// The text to show as a <see cref="string"/>.
+        /// </summary>
         [CanBeNull]
         public string Text { get; }
 
+        /// <summary>
+        /// The text to show as hex bytes.
+        /// </summary>
         [CanBeNull]
         public byte[] Bytes { get; }
 
+        /// <summary>
+        /// Create a new <see cref="MoveToNextLineShowText"/>.
+        /// </summary>
+        /// <param name="text">The text to show.</param>
         public MoveToNextLineShowText(string text)
         {
             Text = text;
         }
-
+        
+        /// <summary>
+        /// Create a new <see cref="MoveToNextLineShowText"/>.
+        /// </summary>
+        /// <param name="hexBytes">The bytes of the text to show.</param>
         public MoveToNextLineShowText(byte[] hexBytes)
         {
             Bytes = hexBytes;
         }
 
+        /// <inheritdoc />
         public void Run(IOperationContext operationContext, IResourceStore resourceStore)
         {
             var move = MoveToNextLine.Value;
@@ -37,11 +61,23 @@
             showText.Run(operationContext, resourceStore);
         }
 
+        /// <inheritdoc />
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            if (Bytes == null)
+            {
+                stream.WriteText($"({Text}) {Symbol}");
+                stream.WriteNewLine();
+            }
+            else
+            {
+                var hex = BitConverter.ToString(Bytes.ToArray()).Replace("-", string.Empty);
+                stream.WriteText($"<{hex}> {Symbol}");
+                stream.WriteNewLine();
+            }
         }
 
+        /// <inheritdoc />
         public override string ToString()
         {
             return $"{Text} {Symbol}";