diff -ur --unidirectional-new-file skipsrc-1.0.orig/skip/man/skiphost.1m work.new/skip/man/skiphost.1m
--- skipsrc-1.0.orig/skip/man/skiphost.1m	Fri Oct 25 13:12:57 1996
+++ work.new/skip/man/skiphost.1m	Mon Jan 24 12:35:41 2000
@@ -42,6 +42,8 @@
 .BI \-s " sender NSID       "   \-S " sender key ID"...
 .if n .ti +8n
 .BI \-v " SKIP version      "   \-A " tunnel address  " \-T
+.if n .ti +8n
+.BI \-f " source IP address "
 ]
 .if n .ti +5n
 [
@@ -53,9 +55,13 @@
 .if n .ti +8n
 .BI \-r " receiver NSID     "   \-R " receiver key ID"...
 .if n .ti +8n
+.BI \-f " source IP address "
+.if n .ti +8n
 .BI \-s " sender NSID       "   \-S " sender key ID"...
 .if n .ti +8n
 .BI \-v " SKIP version      "   \-A " tunnel address  " \-T
+.if n .ti +8n
+.BI \-f " source IP address "
 ]
 .SH DESCRIPTION
 .B
@@ -185,6 +191,12 @@
 address in outgoing packets with the supplied value.
 This permits hiding of network topology.
 By default, the tunnel address is set to the destination address. 
+.TP 
+.BI \-f " source IP address"
+This option is used in tunneling mode to replace the source IP
+address in outgoing packets with the supplied value.
+This permits hiding of network topology.
+By default, the source address is not changed when the packet is encrypted.
 .TP 
 .BI \-T
 Encrypt or authenticate only the data part of the IP packet. By default,