git-diff-tree: fix output with just "--pretty".

[git.git] / diff-tree.c

diff --git a/diff-tree.c b/diff-tree.c
index 3c88385..6c98e62 100644 (file)
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -507,6 +507,7 @@ int main(int argc, const char **argv)
                }
                if (!strncmp(arg, "--pretty", 8)) {
                        verbose_header = 1;
+                       header_prefix = "diff-tree ";
                        commit_format = get_commit_format(arg+8);
                        continue;
                }