wrong expectation from "git log -p"

If running "git log -p parse-options.*", the last commit is 
df217ed6430efe444a09fffdafd39720ae3f9864
There are the changes this commit makes towards parse-options.*.

I was expecting to see the full commit with all changes and not only 
towards the 2 files - only including the two files.

Is my expactation wrong or is this a bug?

	Thomas