Update source/how-we-work/version-control/pull-requests.html.md

Co-authored-by: domoscargin <brett.kyle@digital.cabinet-office.gov.uk>

Author: 36degrees

source/how-we-work/version-control/pull-requests.html.md

@@ -54,6 +54,7 @@ The PR should be reviewed by 2 developers if:
 
 - it's a major version bump or the release notes suggest there are breaking changes
 - it changes the built site or package
+- a developer makes changes to the PR
 
 Otherwise the pull request only needs to be reviewed by 1 developer.