diff --git a/lib/libc/gen/sysctl.3 b/lib/libc/gen/sysctl.3
index 43001551aed3..1c28f23dbe17 100644
--- a/lib/libc/gen/sysctl.3
+++ b/lib/libc/gen/sysctl.3
@@ -1,4 +1,4 @@
-.\"	$NetBSD: sysctl.3,v 1.6 1995/08/04 18:36:13 thorpej Exp $
+.\"	$NetBSD: sysctl.3,v 1.7 1995/09/30 07:03:54 thorpej Exp $
 .\"
 .\" Copyright (c) 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -451,6 +451,7 @@ The currently defined protocols and names are:
 .It ip	redirect	integer	yes
 .It ip	ttl	integer	yes
 .It icmp	maskrepl	integer	yes
+.It tcp rfc1323	integer	yes
 .It udp	checksum	integer	yes
 .El
 .Pp
@@ -469,6 +470,8 @@ the system.
 This value applies to normal transport protocols, not to ICMP.
 .It Li icmp.maskrepl
 Returns 1 if ICMP network mask requests are to be answered.
+.It Li tcp.rfc1323
+Returns 1 if RFC1323 extensions to TCP are enabled.
 .It Li udp.checksum
 Returns 1 when UDP checksums are being computed and checked.
 Disabling UDP checksums is strongly discouraged.
@@ -651,6 +654,8 @@ definitions for third level Internet identifiers and
 fourth level IP identifiers
 .It Pa <netinet/icmp_var.h>
 definitions for fourth level ICMP identifiers
+.It Pa <netinet/tcp_var.h>
+definitions for fourth level TCP identifiers
 .It Pa <netinet/udp_var.h>
 definitions for fourth level UDP identifiers
 .El