If Prettifier cannot auto-fix changes, for example because they come from a fork outside your GitHub organization, it adds a comment to notify the contributor about your project’s formatting guidelines. Prettifier adds only one such message per pull request, even if later commits contain more formatting problems.
You can customize this message in the configuration file:
cannot-prettify-template: > Thanks for your contribution and welcome to this project! We format our source code using [Prettier](https://prettier.io). Please format your contribution by running prettier --write .