Why doesn't my global .gitignore file ignore?

$ cat ~/.gitconfig
[core]
        editor = vim
        excludefiles = /home/augustin/.gitignore
$ cat ~/.gitignore
toto
$ mkdir git_test
$ cd git_test/
$ git init
$ touch toto
$ git status

# On branch master
#
# Initial commit
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#       toto
nothing added to commit but untracked files present (use "git add" to track)
$ git --version
git version 1.6.3.3

Why isn't toto being ignored?

Other settings in ~/.gitconfig are taken into account (colors, editor).

Solution 1:

git config --global core.excludesfile ~/.gitignore