diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7f627a26c4..bb92630492 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -5,7 +5,7 @@ please open an issue on GitHub.
 
 ## Pull Requests
 1. Fork the repo and create your branch from `master`.
-2. If you've added code that should be tested, add tests
+2. If you've added code that should be tested, add tests.
 3. If you've changed APIs, update the documentation.
 4. Ensure the test suite passes.
 5. Make sure your code lints.