diff --git a/site/docs/installation.md b/site/docs/installation.md
index 408a2980..13725578 100644
--- a/site/docs/installation.md
+++ b/site/docs/installation.md
@@ -19,6 +19,8 @@ you’ll need to make sure your system has before you start.
 - [Ruby](http://www.ruby-lang.org/en/downloads/)
 - [RubyGems](http://rubygems.org/pages/download)
 - Linux, Unix, or Mac OS X
+- [NodeJS](http://nodejs.org), or another JavaScript runtime (for
+  CoffeeScript support).
 
 <div class="note info">
   <h5>Running Jekyll on Windows</h5>