diff --git a/README.md b/README.md
index 336e042..c4037cc 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,8 @@ This should be updated fairly regularly. As usual, **pull requests are encourage
 * [Mozilla Developer Networks - Best Documentation on all Web Technologies](https://developer.mozilla.org/en-US/) (contributed by [Rajeev N B @rBharshetty](https://twitter.com/#!/rBharshetty))
 * [Android Developer Documentation](http://developer.android.com/guide/index.html) (contributed by [Rajeev N B @rBharshetty](https://twitter.com/#!/rBharshetty))                       
 * [ØMQ - The Guide](http://zguide.zeromq.org/page:all) - Exciting documentation for an exciting lib. Concise working code examples available in multiple languages. Concepts are explained clearly. (contributed by [kindkid](https://github.com/kindkid))
-* [Postmark Developer Docs](http://developer.postmarkapp.com/) - Simple, easy to navigate, informative. 
+* [Postmark Developer Docs](http://developer.postmarkapp.com/) - Simple, easy to navigate, informative.
+* [Twitter Developers Docs](https://dev.twitter.com/docs) -  In-depth and very well organized. (contributed by [@tsantero](https://twitter.com/#!/tsantero))
 
 ### Writing about Docs (again, in no particular order)