diff --git a/README.md b/README.md
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+++ b/README.md
@@ -4,6 +4,7 @@
 [![NPM downloads][downloads-image]][downloads-url]
 [![Build status][travis-image]][travis-url]
 [![Test coverage][coveralls-image]][coveralls-url]
+[![Greenkeeper badge](https://badges.greenkeeper.io/blakeembrey/array-flatten.svg)](https://greenkeeper.io/)
 
 > Flatten nested arrays.