There exist a lot of pull requests, mainly documentation, that remain unmerged, even though the changes are very small (typos etc.). Most of these have in common that the commit messages don't follow the guidelines outlined in contributing (https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md), almost at the very end. Is this the reason why they remain unmerged? In any case, users should get better instructions regarding the commit messages when they send a pull request. Is there a github Api for that? The default commit message provided is "Update [filename]", can that be changed? Or is it possible to teach the bot to parse commit messages and add a note if it is not correct?