diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 31c4904..1aeaf5c 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -3,7 +3,7 @@ We love pull requests. Here's a quick guide:
 1. Fork the repo.
 
 2. Run the tests. We only take pull requests with passing tests, and it's great
-to know that you have a clean slate: `bundle && rake`
+to know that you have a clean slate: `bundle && bundle exec rake`
 
 3. Add a test for your change. Only refactoring and documentation changes
 require no new tests. If you are adding functionality or fixing a bug, we need