reverting initial commit

Starting a new project I create a new repo and added some files for the
initial revision of the project, something like:

mkdir repo.git
cd repo.git
git init
touch file
git add file
git ci -m "initial revision"

Now one file was not meant to be committed, I wanted to revert this commit:

git reset HEAD^

fatal: ambiguous argument 'HEAD^': unknown revision or path not in the
working tree.
Use '--' to separate paths from revisions

I understand that HEAD^ does not exist, is there a way to do that?

Thanks,
Pascal.

-- 

--|------------------------------------------------------
--| Pascal Obry                           Team-Ada Member
--| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE
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--|    http://www.obry.net  -  http://v2p.fr.eu.org
--| "The best way to travel is by means of imagination"
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