Amending the commit message :-
git commit --amend
This command will open your editor, You can change the commit message of the most recent commit.Commit message can directly change from command line using below command :-
git commit --amend -m "New commit message"
If code already pushed to remote branch then you’ll need to force push the commit using following command :-
git push <remote> <branch> --force # Or git push <remote> <branch> -f
Warning: force-pushing will overwrite the remote branch with the state of your local one.
Amending commits will update the SHA IDs which poses a problem if other developer have copies of old commit .