It’s generally good practice to rebase commits on a topic branch into a single commit before merging. It results in a much cleaner commit history, and makes rollbacks easier. The Question However, the question was raised: what happens if you… fix a bug (commit 1) create a Pull Request get feedback via the Pull Request fix the bug fix (commit 2) rebase those two commits together (new tree-ish) push that back to GitHub (requires push -f ) The answer is based on understanding that a GitHub pull request has two forms of commenting: * comments on the pull request itself * comments on the commits that the pull request encapsulates.