1diff --git a/Documentation/diff-format.txt b/Documentation/diff-format.txt 2index 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 7 prefer context diff: 8 9- GIT_DIFF_OPTS=-c git-diff-index -p $(cat .git/HEAD) 10+ GIT_DIFF_OPTS=-c git-diff-index -p HEAD 11 12 13 2. When the environment variable 'GIT_EXTERNAL_DIFF' is set, the