diff --git a/README.md b/README.md
index e5ac722..ffda11f 100644
--- a/README.md
+++ b/README.md
@@ -11,8 +11,6 @@ The simplest way to group by:
 
 :cake: Get the entire series - **the other best part**
 
-Works with Rails 3.1+
-
 Supports PostgreSQL, MySQL, and Redshift, plus arrays and hashes
 
 [![Build Status](https://travis-ci.org/ankane/groupdate.svg?branch=master)](https://travis-ci.org/ankane/groupdate)
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libgit2 0.21.0