diff --git a/site/_docs/installation.md b/site/_docs/installation.md
index 5ca2bb51..99709c71 100644
--- a/site/_docs/installation.md
+++ b/site/_docs/installation.md
@@ -15,7 +15,7 @@ Installing Jekyll is easy and straight-forward, but there are a few
 requirements you’ll need to make sure your system has before you start.
 
 - [Ruby](http://www.ruby-lang.org/en/downloads/) (including development
-  headers)
+  headers, v1.9.3 or above for Jekyll 2 and v2 or above for Jekyll 3)
 - [RubyGems](http://rubygems.org/pages/download)
 - Linux, Unix, or Mac OS X
 - [NodeJS](http://nodejs.org), or another JavaScript runtime (Jekyll 2 and