diff --git a/README.rdoc b/README.rdoc
index 21e087a..fef1e6e 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -32,7 +32,7 @@ As plugin (from master)
 As gem (in beta)
 
   # in Gemfile
-  gem 'validates_timeliness', '3.0.0.beta'
+  gem 'validates_timeliness', '>= 3.0.0.beta'
 
   # Run bundler
   $ bundle install