# How to contribute ## Single-change commits and pull requests A git commit ought to be a self-contained, single change with a descriptive message. This helps with review and with identifying or reverting changes if issues are uncovered later on. **Pull requests typically comprise a single git commit.** (In some cases, for instance for large refactors or internal rewrites, they may contain several.) In preparing a pull request for review, you may need to squash together multiple commits. We ask that you do this prior to sending the PR for review if possible. The `git rebase -i` command might be useful to this end. ## Contributor license agreement (CLA) Contributions to this project must be accompanied by a Contributor License Agreement. You (or your employer) retain the copyright to your contribution; this simply gives us permission to use and redistribute your contributions as part of the project. Head over to to see your current agreements on file or to sign a new one. You generally only need to submit a CLA once, so if you've already submitted one (even if it was for a different project), you probably don't need to do it again.