diff --git a/readme.md b/readme.md
index ba35dd4..d403278 100644
--- a/readme.md
+++ b/readme.md
@@ -2,5 +2,6 @@ UPN
 =====================
 
 [![Build Status](https://img.shields.io/travis/HegartyMaths/upn.svg?branch=master&style=flat-square)](https://travis-ci.org/HegartyMaths/upn)
+[![Coverage Status](https://img.shields.io/coveralls/HegartyMaths/upn.svg?branch=master&style=flat-square)](https://coveralls.io/github/HegartyMaths/upn?branch=master)
 
 A simple tool for creating and validating UPNs.