diff --git a/README.md b/README.md
index 9103088..6f94c10 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,8 @@ See the READMEs for these projects for more information.
 ## Overview
 
 ```ruby
+require "test_helper"
+
 class UserTest < ActiveSupport::TestCase
   context "associations" do
     should have_many(:posts)