Mention ``show mp''.

Describe ACFComp correctly.

1 files changed, 12 insertions, 3 deletions

diff --git a/usr.sbin/ppp/ppp/ppp.8 b/usr.sbin/ppp/ppp/ppp.8
index dc7ff263cf2..8a53bb9ac2d 100644
--- a/usr.sbin/ppp/ppp/ppp.8
+++ b/usr.sbin/ppp/ppp/ppp.8
@@ -1,4 +1,4 @@
-.\" $Id: ppp.8,v 1.37 1999/04/21 21:27:50 aaron Exp $
+.\" $Id: ppp.8,v 1.38 1999/05/02 08:54:01 brian Exp $
 .Dd 20 September 1995
 .nr XX \w'\fC00'
 .Os FreeBSD
@@ -2198,8 +2198,15 @@ may be one of the following:
 .Bl -tag -width XX
 .It acfcomp
 Default: Enabled and Accepted.  ACFComp stands for Address and Control
-Field Compression.  Non LCP packets usually have very similar address
-and control fields - making them easily compressible.
+Field Compression.  Non LCP packets will usually have an address
+field of 0xff (the All-Stations address) and a control field of
+0x03 (the Unnumbered Information command).  If this option is
+negotiated, these two bytes are simply not sent, thus minimising
+traffic.
+.Pp
+See
+.Pa rfc1662
+for details.
 .It chap Ns Op \&05
 Default: Disabled and Accepted.  CHAP stands for Challenge Handshake
 Authentication Protocol.  Only one of CHAP and PAP (below) may be
@@ -4346,6 +4353,8 @@ Show the current log values.
 Show current memory statistics.
 .It show modem
 Show low level link information.
+.It show mp
+Show Multi-link information.
 .It show proto
 Show current protocol totals.
 .It show route