git commit --amend

For example, if the commit message you want to modify is 4 commits back, then first REBASE your repository to the last 4 commit:

  git rebase -i HEAD~4

This will open up the commits in $EDITOR. Change the first word on the line which corresponds to the commit you want to modify from pick to reword.

Then modify the commit message as required.

Finally git push --force to send your amended commits upstream.

• https://www.w3docs.com/snippets/git/how-to-change-commit-message.html
• https://gist.github.com/nepsilon/156387acf9e1e72d48fa35c4fabef0b4