add file to last commit amend don't change message code example

Example 1: git amend

git commit --amend

Example 2: git command change to previous comit

git revert --no-commit 0766c053..HEAD
git commit


If you really do want to have individual commits 
(instead of reverting everything with one big commit), 
then you can pass --no-edit instead of --no-commit, 
so that you don't have to edit a commit 
message for each reversion. – user456814