diff --git a/COMPOSITE_TODO b/COMPOSITE_TODO
index c40996339d..1b22196c80 100644
--- a/COMPOSITE_TODO
+++ b/COMPOSITE_TODO
@@ -19,6 +19,8 @@ Sources:
             to understand
 - libcm (metacity) : cvs -d :pserver:anonymous@anoncvs.gnome.org:/cvs/gnome co libcm
     - no idea about it
+    
+- http://opengl.org - documentation - OpenGL Redbook, GLX docs, extensions docs
 
 TODO: