diff --git a/README.md b/README.md
index c239962d8c6..22cfe37650f 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@
 [![Build Status](https://travis-ci.org/firebase/firebase-js-sdk.svg?branch=master)](https://travis-ci.org/firebase/firebase-js-sdk)
 [![Build Status](https://saucelabs.com/buildstatus/firebase-oss)](https://saucelabs.com/u/firebase-oss)
 [![Version](https://img.shields.io/npm/v/firebase.svg?label=version)](https://www.npmjs.com/package/firebase)
+[![Coverage Status](https://coveralls.io/repos/github/firebase/firebase-js-sdk/badge.svg?branch=master)](https://coveralls.io/github/firebase/firebase-js-sdk?branch=master)
 <!-- END BADGES -->
 
 The Firebase JavaScript SDK implements the client-side libraries used by