diff --git a/Document-Layout-Analysis.md b/Document-Layout-Analysis.md
index a110f7b..e251f71 100644
--- a/Document-Layout-Analysis.md
+++ b/Document-Layout-Analysis.md
@@ -181,6 +181,7 @@ var blocks = DocstrumBoundingBoxes.Instance.GetBlocks(words,
 ![docstrum bounding boxes example](https://github.com/UglyToad/PdfPig/blob/master/documentation/Document%20Layout%20Analysis/docstrum%20bounding%20boxes%20example.png)
 
 # Reading order detectors
+Reading order detectors deal with the task of finding the blocks' reading order in a page. 3 different methods are currently available:
 - [__Default Reading Order Detector__](https://github.com/UglyToad/PdfPig/wiki/Document-Layout-Analysis#default-reading-order-detector)
 - [__Rendering Reading Order Detector__](https://github.com/UglyToad/PdfPig/wiki/Document-Layout-Analysis#rendering-reading-order-detector)
 - [__Unsupervised Reading Order Detector__](https://github.com/UglyToad/PdfPig/wiki/Document-Layout-Analysis#unsupervised-reading-order-detector)