diff --git a/README.md b/README.md
index c807d76..6ea9919 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ Rewrite of my twitter\_ebooks code. While the original was solely a tweeting Mar
 
 ## Installation
 
+Requires Ruby 1.9.3+
+
 ```bash
 gem install twitter_ebooks
 ```