diff --git a/TODO b/TODO
index 743f356..b7e74b6 100644
--- a/TODO
+++ b/TODO
@@ -7,3 +7,4 @@
     http://www.json.org/
     http://yuiblog.com/blog/2006/09/26/for-in-intrigue/
     http://dean.edwards.name/weblog/2006/07/enum/
+    http://www.prototypejs.org/