diff --git a/README.markdown b/README.markdown
index 51a3052..34db3ec 100644
--- a/README.markdown
+++ b/README.markdown
@@ -49,7 +49,7 @@ how to install and run on your own computer (linux/osx)
 	- redis-client
 	- redis
 	- sanitizer
-	- socket.io
+	- socket.io@0.6.16 (you need to install a 0.6.x version of socket.io until the code is updated to work with the 0.7.x version)
 	- simplesets
 	- connect-redis
 	- (and perhaps more which you will notice when you try to start it)