Quick question: how to generate a patch?

Hi all,

I'm a newbie of git. I have a question about how to generate a patch by git.
I want to make a patch againt git repository HEAD. So in my local
tree, I do the command:

git diff -p > my.patch

The file my.patch is generated. But the unchanged files information is
also included in the patch file. It should be quiet.
Was I wrong to use git by this way?

Thanks for your hints.

Regards,
-Aubrey
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