diff --git a/README.md b/README.md
index 95f1e64..13d8b30 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Rewrite of my twitter\_ebooks code. While the original was solely a tweeting Mar
 
 ## Installation
 
-Requires Ruby 1.9.3+
+Requires Ruby 1.9.3+ (2.1+ recommended)
 
 ```bash
 gem install twitter_ebooks