diff --git a/README b/README
index b022646b..4e1d57c9 100644
--- a/README
+++ b/README
@@ -13,6 +13,8 @@ Portions (C):
 	Bob Osola <bobosola@gmail.com> (pngfix.js)
 	Sundar Dorai-Raj <sdoraira@vt.edu> (isNumeric() in functions.js)
 
+Uses Prototype javascript library, from http://prototype.conio.net/
+
 Licensed under GNU GPL version 2
 
 Features Overview