diff --git a/usr.bin/tip/tip/cu.1 b/usr.bin/tip/tip/cu.1
index 328623ce55484e..5852a2a6e6d562 100644
--- a/usr.bin/tip/tip/cu.1
+++ b/usr.bin/tip/tip/cu.1
@@ -1,3 +1,6 @@
+.\"-
+.\" SPDX-License-Identifier: BSD-3-Clause
+.\"
 .\"	$OpenBSD: cu.1,v 1.3 2006/06/07 06:35:59 mbalmer Exp $
 .\"
 .\" Copyright (c) 1980, 1990, 1993
@@ -32,7 +35,7 @@
 .Os
 .Sh NAME
 .Nm cu
-.Nd call UNIX
+.Nd call UNIX over a serial line
 .Sh SYNOPSIS
 .Nm
 .Op Fl ehot