diff --git a/Gemfile b/Gemfile
index 2f446c95..f2d5fead 100644
--- a/Gemfile
+++ b/Gemfile
@@ -18,3 +18,5 @@ else
 end
 
 gemspec
+
+ruby "1.9.0"
diff --git a/README.rdoc b/README.rdoc
index 9b3baf8d..732388f1 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -10,6 +10,13 @@ CanCan is an authorization library for Ruby on Rails which restricts what resour
 
 == Installation
 
+In <b>Rails 4</b>, add this to your Gemfile and run the +bundle+ command.
+
+  gem "cancan"
+
+Alternatively, you can install it using: 
+  gem install cancan
+
 In <b>Rails 3</b>, add this to your Gemfile and run the +bundle+ command.
 
   gem "cancan"