diff --git a/README.md b/README.md
index 99c4b6b..6433d23 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,8 @@ Or install it yourself as:
 ##  Usage
 
 ```ruby
+require 'rubygems/server'
+
 gem_server = Gem::Server.new Gem.dir, 8089, false
 gem_server.run
 ```