diff --git a/Readme.md b/Readme.md
index b8aa36ee..51a86e17 100644
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@@ -9,6 +9,8 @@ The goal is to expose a few simple methods that mimic user actions (like `goto`,
 
 Under the covers it uses [Electron](http://electron.atom.io/), which is similar to [PhantomJS](http://phantomjs.org/) but roughly [2 times faster](https://github.com/segmentio/nightmare/issues/484#issuecomment-184519591) and more modern.
 
+[Niffy](https://github.com/segmentio/niffy) is a perceptual diffing tool built on Nightmare. It helps you detect UI changes and bugs across releases of your web app.
+
 [Daydream](https://github.com/segmentio/daydream) is a complementary chrome extension built by [@stevenmiller888](https://github.com/stevenmiller888) that generates Nightmare scripts for you while you browse.
 
 Many thanks to [@matthewmueller](https://github.com/matthewmueller) and [@rosshinkley](https://github.com/rosshinkley) for their help on Nightmare.