diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 0ad0a0323a..de43db075a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -35,6 +35,7 @@ Do yo thing!
 up the related commits and display them on the Jira issue.
 * Make sure you have added the necessary tests for your changes.
 * Run _all_ the tests to assure nothing else was accidentally broken.
+* Make sure your source does not violate the checkstyles.
 
 _Prior to commiting, if you want to pull in the latest upstream changes (highly
 appreciated btw), please use rebasing rather than merging.  Merging creates