diff --git a/share/man/man4/netintro.4 b/share/man/man4/netintro.4
index 7fe78f9c5112..cfbd7f7faf08 100644
--- a/share/man/man4/netintro.4
+++ b/share/man/man4/netintro.4
@@ -1,4 +1,4 @@
-.\"	$NetBSD: netintro.4,v 1.10 1999/12/15 22:07:33 abs Exp $
+.\"	$NetBSD: netintro.4,v 1.11 2000/04/08 03:31:05 erh Exp $
 .\"
 .\" Copyright (c) 1983, 1990, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -40,6 +40,7 @@
 .Nm netintro
 .Nd introduction to networking facilities
 .Sh SYNOPSIS
+.Fd #include <sys/types.h>
 .Fd #include <sys/socket.h>
 .Fd #include <net/route.h>
 .Fd #include <net/if.h>