README.md: improve

Author: fatih

README.md

@@ -1,7 +1,8 @@
 # WebsocketProxy [![GoDoc](https://godoc.org/github.com/koding/websocketproxy?status.png)](http://godoc.org/github.com/koding/websocketproxy) [![Build Status](https://travis-ci.org/koding/websocketproxy.png)](https://travis-ci.org/koding/websocketproxy)
 
-WebsocketProxy is an http.Handler interface that you can plug into your
-existing Go webserver to provide WebSocket reverse proxy.
+WebsocketProxy is an http.Handler interface build on top of
+[gorilla/websocket](https://github.com/gorilla/websocket) that you can plug
+into your existing Go webserver to provide WebSocket reverse proxy.
 
 ## Install