diff --git a/todo.txt b/todo.txt
index 5ce56df..2f6c506 100644
--- a/todo.txt
+++ b/todo.txt
@@ -76,6 +76,8 @@ http://tclap.sourceforge.net/
 
 http://sourceforge.net/projects/libcrn/
 
+http://glm.g-truc.net/
+
 ====================
 
 http://www.efytimes.com/e1/fullnews.asp?edid=117053