git commit (or git-commit-script) question

Hey all,

git-commit-script --help says:

git commit [-a] [-m <message>] [-F <logfile>] [(-C|-c) <commit>] [<path>...]

That made me assume that if I do:

   git-commit-script somedir

it would *only* commit the changes I've made in "somedir", but it appears to commit *all* files that have changed (and shows all files in the list of changed files in the commit message it displays in the editor), as if it's completely ignoring the <path> argument.

Known problem? I got this using git that I pulled from kernel.org earlier this morning.