diff --git a/README.md b/README.md
index 02a5669..747518e 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@ Sonyflake
 [![GoDoc](https://godoc.org/github.com/sony/sonyflake?status.svg)](http://godoc.org/github.com/sony/sonyflake)
 [![Build Status](https://travis-ci.org/sony/sonyflake.svg?branch=master)](https://travis-ci.org/sony/sonyflake)
 [![Coverage Status](https://coveralls.io/repos/sony/sonyflake/badge.svg?branch=master&service=github)](https://coveralls.io/github/sony/sonyflake?branch=master)
+[![Go Report Card](https://goreportcard.com/badge/github.com/sony/sonyflake)](https://goreportcard.com/report/github.com/sony/sonyflake)
 
 Sonyflake is a distributed unique ID generator inspired by [Twitter's Snowflake](https://blog.twitter.com/2010/announcing-snowflake).  
 A Sonyflake ID is composed of