diff --git a/README.md b/README.md
index ddd64d9..9286343 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ Currently, there is no such thing as Ruby Cron for Rails. Well, there's [Wheneve
 
 ## Requirements
 
-Tested with latest MRI Ruby (2.3, 2.2, 2.1 and 2.0) and Rails 3.2+ (including Rails 5).
+Tested with latest MRI Ruby (2.3, 2.2, 2.1, and 2.0), Rails 4.*, and Rails 5.*.
 Other versions are untested but might work fine.