diff --git a/README.md b/README.md
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@@ -37,7 +37,8 @@ the Design of Network-based Software Architectures](https://www.ics.uci.edu/~fie
 * [HTTP API design guide extracted from work on the Heroku Platform API](https://github.com/interagent/http-api-design)
 * [Best Practices for Designing a Pragmatic RESTful API](http://www.vinaysahni.com/best-practices-for-a-pragmatic-restful-api)
 * [How to design a REST API?](http://blog.octo.com/en/design-a-rest-api/) - Full guide tackling security, pagination, filtering, versioning, partial answers, CORS, etc.
-* [Enterprise Integration Using REST](http://martinfowler.com/articles/enterpriseREST.html) by the famous Martin Fowler
+* [Richardson Maturity Model](http://martinfowler.com/articles/richardsonMaturityModel.html) - Explained by Martin Fowler, originally presented by Leonard Richardson at the [QCon 2008](https://www.crummy.com/writing/speaking/2008-QCon/act3.html).
+* [Enterprise Integration Using REST](http://martinfowler.com/articles/enterpriseREST.html) - Discusses the constraints and flexibility that you have with nonpublic APIs, and lessons learned from doing large scale RESTful integration across multiple teams.
 * [HATEOAS](http://timelessrepo.com/haters-gonna-hateoas) - Clear explanation on what HATEOAS is, and why you should use it.
 * [How to GET a cup of coffee](http://www.infoq.com/articles/webber-rest-workflow/)