} else if (cmd->updateref &&
                        (write_in_full(lock->lock_fd,
                                sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
-                        write_in_full(lock->lock_fd, "\n", 1) != 1 ||
+                        write_str_in_full(lock->lock_fd, "\n") != 1 ||
                         close_ref(lock) < 0)) {
                        status |= error("Couldn't write %s",
                                lock->lk->filename);
 
 int cmd_reflog(int argc, const char **argv, const char *prefix)
 {
+       if (argc > 1 && !strcmp(argv[1], "-h"))
+               usage(reflog_usage);
+
        /* With no command, we default to showing it. */
        if (argc < 2 || *argv[1] == '-')
                return cmd_log_reflog(argc, argv, prefix);