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-rw-r--r--builtin/diff-index.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/builtin/diff-index.c b/builtin/diff-index.c
index 1af373d..02dd35b 100644
--- a/builtin/diff-index.c
+++ b/builtin/diff-index.c
@@ -17,6 +17,9 @@ int cmd_diff_index(int argc, const char **argv, const char *prefix)
int i;
int result;
+ if (argc == 2 && !strcmp(argv[1], "-h"))
+ usage(diff_cache_usage);
+
init_revisions(&rev, prefix);
gitmodules_config();
git_config(git_diff_basic_config, NULL); /* no "diff" UI options */