Add note about properly setting up Git

sebastianbergmann · Sep 2, 2015 · c0a9c60 · c0a9c60
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -11,6 +11,8 @@ Please note that this project is released with a [Contributor Code of Conduct](C
 * Add tests for it. This is important so we don't break it in a future version unintentionally.
 * Send a pull request. Bonus points for topic branches.
 
+Please make sure that you have [set up your user name and email address](http://git-scm.com/book/en/v2/Getting-Started-First-Time-Git-Setup) for use with Git. Strings such as `silly nick name <root@localhost>` look really stupid in the commit history of a project.
+
 Pull requests for bug fixes must be based on the current stable branch whereas pull requests for new features must be based on `master`.
 
 We are trying to keep backwards compatibility breaks in PHPUnit to an absolute minimum. Please take this into account when proposing changes.