diff --git a/README.md b/README.md
index 08df8a1..94008ce 100644
--- a/README.md
+++ b/README.md
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 [![Build Status](https://travis-ci.org/wbotelhos/rating.svg)](https://travis-ci.org/wbotelhos/rating)
 [![Gem Version](https://badge.fury.io/rb/rating.svg)](https://badge.fury.io/rb/rating)
+[![Maintainability](https://api.codeclimate.com/v1/badges/cc5efe8b06bc1d5e9e8a/maintainability)](https://codeclimate.com/github/wbotelhos/rating/maintainability)
 
 A true Bayesian rating system with scope and cache enabled.