I just did a commit:
git commit -m "este es un comentario"
However, I have suddenly realized that this message is not correct. Can I modify it? If yes, how?
If I rewrite
git commit -m "un nuevo comentario" will do another commit instead of modifying the one I already did.
The quickest and most practical option is to use:
git commit --amend
After which the editor will open so you can modify the message.
If you want to write something totally new, you can directly say:
git commit --amend -m "Este es el nuevo comentario"
You can see more details in the answer in the English version to Edit an incorrect commit message in Git .