How do I simply create a patch from my latest git commit?

I am looking for the command for creating a patch from the last commit made.

My workflow sometimes looks like this:

vi some.txt
git add some.txt
git commit -m "some change"

Now I just want to write:

git create-patch-from-last-commit-to-file SOME-PATCH0001.patch

What should I put there instead of create-patch-from-last-commit-to-file?