diff --git a/README.md b/README.md
index 34c9e71..ab6660c 100644
--- a/README.md
+++ b/README.md
@@ -416,16 +416,16 @@ Reveal.initialize({
 	},
 
 	dependencies: [
-		{ src: 'socket.io/socket.io.js', async: true },
+		{ src: '//cdnjs.cloudflare.com/ajax/libs/socket.io/0.9.10/socket.io.min.js', async: true },
 		{ src: 'plugin/multiplex/client.js', async: true },
 		{ src: 'plugin/multiplex/master.js', async: true },
 	]
 });
 ```
 
-```multiplex.secret``` should only be configured on those pages you wish to be able to control slide navigation for all clients. Multi-master configurations work, but if you don't want your audience to be able to control your slides, set the secret to ``null``. In this master/slave setup, you should create a publicly accessible page with secret set to ``null``, and a protected page containing your secret.
+```multiplex.secret``` should only be configured on those pages you wish to be able to control slide navigation for all clients. Multi-master configurations work, but if you don't wish your audience to be able to control your slides, set the secret to ``null``. In this master/slave setup, you should create a publicly accessible page with secret set to ``null``, and a protected page containing your secret.
 
-You are very welcome to use the server running at reveal.jit.su, however availability and stability are not guaranteed. For anything mission critical I recommend you run your own server. It is simple to deploy to nodejitsu or run on your own environment.
+You are very welcome to use the socketio server running at reveal.jit.su, however availability and stability are not guaranteed. For anything mission critical I recommend you run your own server. It is simple to deploy to nodejitsu or run on your own environment.
 
 
 ## Theming
diff --git a/plugin/multiplex/index.js b/plugin/multiplex/index.js
index 0b03fc7..35df8e3 100644
--- a/plugin/multiplex/index.js
+++ b/plugin/multiplex/index.js
@@ -15,6 +15,7 @@ var opts = {
 
 io.sockets.on('connection', function(socket) {
 	socket.on('slidechanged', function(slideData) {
+		if (typeof slideData.secret == 'undefined' || slideData.secret == null || slideData.secret === '') return;
 		if (createHash(slideData.secret) === slideData.socketId) {
 			slideData.secret = null;
 			socket.broadcast.emit(slideData.socketId, slideData);