diff --git a/README.md b/README.md
index 4f9e01b..d9dcf4e 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,7 @@ This fork of Whalesong differs from dyoo/whalesong in the following ways:
     Contributed by Emmanuel Schanzer
   * Adds play-sound
     (assumes a browser with html5 audio support)
+    Contributed by Emmanuel Schanzer and Darren Cruse
 
 Note: The implementation of parameters works fine,
       as long as you don't mix parameterize with non-local-exits