Add line to mandate use of GH closure keywords - fixes
@@ -40,6 +40,7 @@ Please read this whole guide and make sure you agree to our DCO agreement (inclu
* Sign-off your commits
* Complete the whole template for issues and pull requests
+* [Reference addressed issues](https://help.github.com/articles/closing-issues-using-keywords/) in the PR description & commit messages - use 'Fixes #IssueNo'
* Always give instructions for testing
* Give us CLI commands and output or screenshots where you can
