diff --git a/README.md b/README.md
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+++ b/README.md
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 ## calc
 
-[![Build Status](https://travis-ci.org/alfredxing/calc.svg?branch=master)](https://travis-ci.org/alfredxing/calc)
+[![GoDoc](https://godoc.org/github.com/alfredxing/calc?status.svg)](https://godoc.org/github.com/alfredxing/calc) [![Build Status](https://travis-ci.org/alfredxing/calc.svg?branch=master)](https://travis-ci.org/alfredxing/calc)
 
 A simple, fast, and intuitive command-line calculator written in Go.