Index: sbin/ifconfig/ifconfig.8
===================================================================
--- sbin/ifconfig/ifconfig.8
+++ sbin/ifconfig/ifconfig.8
@@ -2470,6 +2470,23 @@
 The following parameters are specific to GRE tunnel interfaces,
 .Xr gre 4 :
 .Bl -tag -width indent
+.It Cm tunnel Ar src_addr dest_addr
+Configure the physical source and destination address for IP tunnel
+interfaces.
+The arguments
+.Ar src_addr
+and
+.Ar dest_addr
+are interpreted as the outer source/destination for the encapsulating
+IPv4/IPv6 header.
+.It Fl tunnel
+Unconfigure the physical source and destination address for IP tunnel
+interfaces previously configured with
+.Cm tunnel .
+.It Cm deletetunnel
+Another name for the
+.Fl tunnel
+parameter.
 .It Cm grekey Ar key
 Configure the GRE key to be used for outgoing packets.
 Note that