diff --git a/README.md b/README.md
index 006e3d1..4f81879 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@ go-libwebp
 ==========
 
 [![Build Status](https://travis-ci.org/harukasan/go-libwebp.svg)](https://travis-ci.org/harukasan/go-libwebp)
+[![GoDoc](https://godoc.org/github.com/harukasan/go-libwebp/webp?status.svg)](https://godoc.org/github.com/harukasan/go-libwebp/webp)
 
 A implementation of Go binding for [libwebp](https://developers.google.com/speed/webp/docs/api) written with cgo.