diff --git a/components/engine/CONTRIBUTING.md b/components/engine/CONTRIBUTING.md
index 0e8b98122f..5a1ad4b0ab 100644
--- a/components/engine/CONTRIBUTING.md
+++ b/components/engine/CONTRIBUTING.md
@@ -90,6 +90,10 @@ reference to all the issues that they address.
 
 Pull requests must not contain commits from other users or branches.
 
+Commit messages must start with a capitalized and short summary (max. 50
+chars) written in the imperative, followed by an optional, more detailed
+explanatory text which is separated from the summary by an empty line.
+
 Code review comments may be added to your pull request. Discuss, then make the
 suggested modifications and push additional commits to your feature branch. Be
 sure to post a comment after pushing. The new commits will show up in the pull