diff --git a/Document-Layout-Analysis.md b/Document-Layout-Analysis.md
index 798acf7..504a55d 100644
--- a/Document-Layout-Analysis.md
+++ b/Document-Layout-Analysis.md
@@ -187,13 +187,12 @@ Reading order detectors deal with the task of finding the blocks' reading order
 - [__Unsupervised Reading Order Detector__](https://github.com/UglyToad/PdfPig/wiki/Document-Layout-Analysis#unsupervised-reading-order-detector)
 
 ## [Default Reading Order Detector](https://github.com/UglyToad/PdfPig/blob/master/src/UglyToad.PdfPig.DocumentLayoutAnalysis/ReadingOrderDetector/DefaultReadingOrderDetector.cs)
-TO DO
 
 ### Description
-TO DO
+This reading order detector does nothing. It will return the blocks as they are provided and the `ReadingOrder` of each `TextBlock` remains -1.
 
 ### References
-TO DO
+n/a
 
 ### Usage
 #### Simple case
@@ -216,20 +215,16 @@ using (var document = PdfDocument.Open(@"document.pdf"))
 }
 ```
 
-#### Advanced case
-TO DO
-
 ### Result
-TO DO: image
+n/a
 
 ## [Rendering Reading Order Detector](https://github.com/UglyToad/PdfPig/blob/master/src/UglyToad.PdfPig.DocumentLayoutAnalysis/ReadingOrderDetector/RenderingReadingOrderDetector.cs)
-TO DO
 
 ### Description
-TO DO
+This reading order detector uses the average of the `Letter.TextSequence` contained in each block to determine the reading order.
 
 ### References
-TO DO
+n/a
 
 ### Usage
 #### Simple case
@@ -252,11 +247,8 @@ using (var document = PdfDocument.Open(@"document.pdf"))
 }
 ```
 
-#### Advanced case
-TO DO
-
 ### Result
-TO DO: image
+TO DO
 
 ## [Unsupervised Reading Order Detector](https://github.com/UglyToad/PdfPig/blob/master/src/UglyToad.PdfPig.DocumentLayoutAnalysis/ReadingOrderDetector/UnsupervisedReadingOrderDetector.cs)