The current message is Using comma-separated values with --exclude-group is deprecated and will no longer work in PHPUnit 12. I encountered the deprecation notice and wondered if the feature was removed completely and had to do a code and issue search to see what it was replaced with. Could we include the solution for the deprecation in the message (or maybe as a comment in the code) so people can find it faster? E.g. Using comma-separated values with --exclude-group is deprecated and will no longer work in PHPUnit 12. You can specify --exclude-group multiple times instead. If you agree that on that I could also create a pull request.