diff --git a/free-programming-books.md b/free-programming-books.md
index c40d2704272b6d37eee5527bc2d5480cb571b021..4284b89a224ef2ea3c4efebbea9ba8480958d5fe 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -718,6 +718,7 @@ Original Source: [List of freely available programming books](http://web.archive
 
 ### AutoHotkey
 * [AHKbook - the book for AutoHotkey](http://ahkscript.github.io/ahkbook/index.html)
+* [AutoHotkey Official Documentation](http://ahkscript.org/docs/AutoHotkey.htm) ([CHM](http://ahkscript.org/download/1.1/AutoHotkeyHelp.zip))
 
 
 ### Autotools