Update CONTRIBUTING.md (#5542)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b767c969fb6c0c6bee4a89a3c422073624a62095..96ba2a40f3837fa4a18007178c1cc315ae689b20 100644 (file)
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -34,6 +34,11 @@ CLA
 
 Contributions are now taken under the [.NET Foundation CLA](https://cla2.dotnetfoundation.org/).
 
+Code Review
+=======
+We are requiring code reviews before merging a pull request.
+GitHub won't let you merge a PR until someone from the Mono team approves it.
+
 Testing
 =======