-.\" @(#) $Header: /tcpdump/master/tcpdump/Attic/tcpdump.1,v 1.115 2002-01-25 05:27:27 guy Exp $ (LBL)
+.\" @(#) $Header: /tcpdump/master/tcpdump/Attic/tcpdump.1,v 1.116 2002-02-08 06:45:05 guy Exp $ (LBL)
.\"
.\" Copyright (c) 1987, 1988, 1989, 1990, 1991, 1992, 1994, 1995, 1996, 1997
.\" The Regents of the University of California. All rights reserved.
be root, or
.I tcpdump
must be installed setuid to root, in order to capture in promiscuous
-mode.
+mode. Note that, on many (perhaps all) interfaces, if you don't capture
+in promiscuous mode, you will not see any outgoing packets, so a capture
+not done in promiscuous mode may not be very useful.
.TP
.B Under HP-UX with DLPI:
You must be root or