If you want to change commit message after commit, you can do this by:
git rebase --interactive '^'
With this rebase you want edit your commit comment, after that commit your changes:
git commit --all --amend --no-edit
At last go on with your rebase to finish it:
git rebase --continue
To get back to the HEAD.
SHA-1 of the commit changes, so be creaful by pushing your commits. Don't use git push --fore
To avoid such mistakes there exist so called git hooks.
You have to implement a git hook to check commit message before the commit.
Go to .git/hooks folder in repository.
There is a file called „commit.msg.sample“ .
Remove „sample“ in the file name.
place shell script in file „commit.msg“ which checks the commit message.