diff --git a/README.md b/README.md
index 9e3faca..0670245 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Arduino MIDI Library
 
 [![Build Status](https://travis-ci.org/FortySevenEffects/arduino_midi_library.svg?branch=master)](https://travis-ci.org/FortySevenEffects/arduino_midi_library)
+[![Coveralls](https://img.shields.io/coveralls/FortySevenEffects/arduino_midi_library.svg?maxAge=2592000)](https://coveralls.io/github/FortySevenEffects/arduino_midi_library)
 [![GitHub release](https://img.shields.io/github/release/FortySevenEffects/arduino_midi_library.svg?maxAge=2592000)](https://github.com/FortySevenEffects/arduino_midi_library/releases/latest)
 [![License](https://img.shields.io/github/license/FortySevenEffects/arduino_midi_library.svg?maxAge=2592000)](LICENSE)