diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d1f76e4..4f8cac9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -26,7 +26,7 @@ should submit a Pull Request!
 * 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 a test!
-* Run _all_ the tests to ensure nothing else was broken. We only take pull requests with passing tests.
+* Run _all_ the tests to ensure nothing else was broken. We only take pull requests with passing tests. You can run the tests with `rake test`.
 * Make a note in the `CHANGELOG.md` file with a brief summary of your change under the heading "Unreleased" at the top of the file. If that heading does not exist, you should add it.
 * Check for unnecessary whitespace with `git diff --check` before committing.
 * Structure your commit messages like this: