diff --git a/README.md b/README.md
index 27c85ec..93f2574 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,6 @@
 [![GoDoc](https://godoc.org/github.com/alexflint/go-arg?status.svg)](https://godoc.org/github.com/alexflint/go-arg)
 [![Build Status](https://travis-ci.org/alexflint/go-arg.svg?branch=master)](https://travis-ci.org/alexflint/go-arg)
+[![Coverage Status](https://coveralls.io/repos/alexflint/go-arg/badge.svg?branch=master&service=github)](https://coveralls.io/github/alexflint/go-arg?branch=master)
 
 ## Structured argument parsing for Go