If your intentions are to push-target a remote repo branch and your first pass at a commit change log were incomplete, you can correct the commit statement before pushing like this.
... make some changes ...
git diff # look at unstaged changes
git commit -am"partial description of changes"
... recall more changes unmentioned in commit ...
... amend staged commit statement ...
git commit --amend -m"i missed mentioning these changes ...."
git push