--- a/README.txt
+++ b/README.txt
@@ -1,8 +1,13 @@
+An explanation of the Mozilla Source Code Directory Structure and links to
+project pages with documentation can be found at:
+
+    https://developer.mozilla.org/en/Mozilla_Source_Code_Directory_Structure
+
 For information on how to build Mozilla from the source code, see:
 
     http://developer.mozilla.org/en/docs/Build_Documentation
 
 To have your bug fix / feature added to Mozilla, you should create a patch and
 submit it to Bugzilla (http://bugzilla.mozilla.org). Instructions are at:
 
     http://developer.mozilla.org/en/docs/Creating_a_patch