diff --git a/site/_docs/installation.md b/site/_docs/installation.md
index aee4b594..5ca2bb51 100644
--- a/site/_docs/installation.md
+++ b/site/_docs/installation.md
@@ -18,8 +18,9 @@ requirements you’ll need to make sure your system has before you start.
   headers)
 - [RubyGems](http://rubygems.org/pages/download)
 - Linux, Unix, or Mac OS X
-- [NodeJS](http://nodejs.org), or another JavaScript runtime (for
-  CoffeeScript support).
+- [NodeJS](http://nodejs.org), or another JavaScript runtime (Jekyll 2 and
+earlier, for CoffeeScript support).
+- Python (Jekyll 2 and earlier)
 
 <div class="note info">
   <h5>Running Jekyll on Windows</h5>