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diff --git a/README.md b/README.md
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@@ -2,6 +2,7 @@ Macaroons: Pure haskell implementation of macaroons
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 [![Build Status](https://travis-ci.org/jtanguy/hmacaroons.svg?branch=master)](https://travis-ci.org/jtanguy/hmacaroons)
+[![Coverage Status](https://coveralls.io/repos/jtanguy/hmacaroons/badge.svg?branch=master&service=github)](https://coveralls.io/github/jtanguy/hmacaroons?branch=master)
 [![Join the chat at https://gitter.im/jtanguy/hmacaroons](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/jtanguy/hmacaroons?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 Macaroons is a pure haskell implementation of macaroons. It aims to provide