diff --git a/README.md b/README.md
index c973b84..7eefe8a 100644
--- a/README.md
+++ b/README.md
@@ -4,4 +4,5 @@ Calculate the average of a sequence and its error iteratively, using constant
 memory.
 
 [Documentation](https://docs.rs/average) |
-[crates.io](https://crates.io/crates/average)
+[crates.io](https://crates.io/crates/average) |
+[![Build Status](https://travis-ci.org/vks/average.svg?branch=master)](https://travis-ci.org/vks/average)