diff --git a/README.md b/README.md
index f65fdf8..1bf3294 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-c3 [![Build Status](https://travis-ci.org/masayuki0812/c3.svg?branch=master)](https://travis-ci.org/masayuki0812/c3) [![Dependency Status](https://david-dm.org/masayuki0812/c3.svg)](https://david-dm.org/masayuki0812/c3) [![devDependency Status](https://david-dm.org/masayuki0812/c3/dev-status.svg)](https://david-dm.org/masayuki0812/c3#info=devDependencies)
+c3 [![Build Status](https://travis-ci.org/masayuki0812/c3.svg?branch=master)](https://travis-ci.org/masayuki0812/c3) [![Dependency Status](https://david-dm.org/masayuki0812/c3.svg)](https://david-dm.org/masayuki0812/c3) [![devDependency Status](https://david-dm.org/masayuki0812/c3/dev-status.svg)](https://david-dm.org/masayuki0812/c3#info=devDependencies) [![license](http://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat)](https://github.com/masayuki0812/c3/blob/master/LICENSE)
 ==
 
 c3 is a D3-based reusable chart library that enables deeper integration of charts into web applications.