diff --git a/README.md b/README.md
index a5d0dd2..8ade0d3 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # defaultSortBot [![Build Status](https://travis-ci.org/kn1cht/defaultSortBot.svg?branch=master)](https://travis-ci.org/kn1cht/defaultSortBot) [![Coverage Status](https://coveralls.io/repos/github/kn1cht/defaultSortBot/badge.svg?branch=master)](https://coveralls.io/github/kn1cht/defaultSortBot?branch=master)
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/kn1cht/defaultSortBot.svg)](https://greenkeeper.io/)
+
 Add **Japanese**
 [sort key](https://ja.wikipedia.org/wiki/Help:%E3%82%AB%E3%83%86%E3%82%B4%E3%83%AA#.E3.82.BD.E3.83.BC.E3.83.88.E3.82.AD.E3.83.BC)
 automatically to mediawiki articles as DEFAULTSORT.