diff --git a/README.md b/README.md
index bfbdc591d..1e032552e 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,8 @@ If you want the bleeding edge version of Vagrant, we try to keep master pretty s
 and you're welcome to give it a shot. The following is an example showing how to do this:
 
     rake install
+    
+Ruby 2.0 is needed.
 
 ## Contributing to Vagrant