1 diff --git a/Documentation/diff-format.txt b/Documentation/diff-format.txt
2 index b426a14..97756ec 100644
3 --- a/Documentation/diff-format.txt
4 +++ b/Documentation/diff-format.txt
5 @@ -81,7 +81,7 @@ The "diff" formatting options can be customized via the
6 environment variable 'GIT_DIFF_OPTS'. For example, if you
9 - GIT_DIFF_OPTS=-c git-diff-index -p $(cat .git/HEAD)
10 + GIT_DIFF_OPTS=-c git-diff-index -p HEAD
13 2. When the environment variable 'GIT_EXTERNAL_DIFF' is set, the