diff --git a/readme.md b/readme.md
index 383ba5d..4eb5f1c 100644
--- a/readme.md
+++ b/readme.md
@@ -376,6 +376,7 @@ Inspired by the [awesome](https://github.com/sindresorhus/awesome) list thing.
 - [Mocha](http://visionmedia.github.io/mocha/) - A feature-rich test framework making asynchronous testing simple and fun.
 - [loadtest](https://github.com/alexfernandez/loadtest) - Run load tests for your web application, with an API for automation.
 - [istanbul](https://github.com/gotwarlost/istanbul) - A code coverage tool that computes statement, line, function and branch coverage with module loader hooks to transparently add coverage when running tests.
+- [Sinon.JS](https://github.com/cjohansen/Sinon.JS) - Test spies, stubs and mocks.
 
 
 ### Benchmarking