Update README.md

Author: softius

README.md

@@ -3,6 +3,8 @@ PHP Cross Domain (AJAX) Proxy
 
 An application proxy that can be used to transparently transfer all kind of requests ( including of course XMLHTTPRequest ) to any third part domain. It is possible to define a list of acceptable third party domains and you are encouraged to do so. Otherwise the proxy is open to any kind of requests.
 
+If it is possible to enable CORS on your application server, this proxy is not necessary. Have a look at [how you can enable CORS on your server](http://enable-cors.org/server.html) for further information.
+
 Installation
 --------------