diff --git a/README.md b/README.md
index 5a643f17..cee71014 100644
--- a/README.md
+++ b/README.md
@@ -513,6 +513,7 @@ A curated list of awesome Python frameworks, libraries and software. Inspired by
     * [sandman](https://github.com/jeffknupp/sandman) - Automated REST APIs for existing database-driven systems.
     * [restless](http://restless.readthedocs.org/en/latest/) - Framework agnostic REST framework based on lessons learned from Tastypie.
     * [ripozo](https://github.com/vertical-knowledge/ripozo) - Quickly creating REST/HATEOAS/Hypermedia APIs.
+    * [marshmellow](http://marshmallow.readthedocs.org/en/latest/) - marshmallow is an ORM/ODM/framework-agnostic library for converting complex datatypes, such as objects, to and from native Python datatypes.
 
 ## Authentication