diff --git a/README.md b/README.md
index 2906efe..d8bfd6e 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@ Provides a PHP CodeSniffer ruleset for the MO4 coding standard
 [![Build Status](https://travis-ci.org/mayflower/mo4-coding-standard.svg?branch=master)](https://travis-ci.org/mayflower/mo4-coding-standard)
 [![Build Status](https://codecov.io/gh/mayflower/mo4-coding-standard/branch/master/graph/badge.svg)](https://codecov.io/gh/mayflower/mo4-coding-standard/branch/master/)
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+[![Maintainability](https://api.codeclimate.com/v1/badges/16114548a0315d993868/maintainability)](https://codeclimate.com/github/mayflower/mo4-coding-standard/maintainability)
 
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