README.md in sinatra-websocketio-0.2.6 vs README.md in sinatra-websocketio-0.2.7

@@ -156,9 +156,20 @@
 ```javascript
 io.removeListener("error");  // remove all "error" listener
 ```
 
 
+### Config
+
+```ruby
+set :websocketio, :port => 8080
+```
+or
+
+    % WS_PORT=8080 rackup config.ru
+
+
+
 Sample App
 ----------
 chat app
 
 - https://github.com/shokai/sinatra-websocketio/tree/master/sample