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diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -28,7 +28,7 @@
.\" From: @(#)ifconfig.8 8.3 (Berkeley) 1/5/94
.\" $FreeBSD$
.\"
-.Dd February 1, 2023
+.Dd March 6, 2023
.Dt IFCONFIG 8
.Os
.Sh NAME
@@ -3086,6 +3086,22 @@
.Cm MASTER
and
.Cm BACKUP .
+.It Cm peer Ar address
+Set the address to send (IPv4)
+.Xr carp 4
+announcements to.
+.It Cm mcast
+Restore the default destination address for (IPv4)
+.Xr carp 4
+announcements, which is 224.0.0.18.
+.It Cm peer6 Ar address
+Set the address to send (IPv6)
+.Xr carp 4
+announcements to.
+.It Cm mcast6
+Restore the default destination address for (IPv4)
+.Xr carp 4
+announcements, which is ff02::12.
.El
.Sh ENVIRONMENT
The following environment variables affect the execution of
diff --git a/share/man/man4/carp.4 b/share/man/man4/carp.4
--- a/share/man/man4/carp.4
+++ b/share/man/man4/carp.4
@@ -26,7 +26,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd July 1, 2018
+.Dd March 6, 2023
.Dt CARP 4
.Os
.Sh NAME
@@ -78,6 +78,23 @@
.Dv SIOCSVH
.Xr ioctl 2 .
.Pp
+CARP defaults to using multicast messages, but can be configured to unicast
+announcements to peers using the
+.Cm peer
+and
+.Cm peer6
+parameters. Default addresses can be restored using
+.Cm mcast
+and
+.Cm mcast6 .
+Note that TTL verification is disabled if the peer address is not a multicast
+address.
+These values can be configured using
+.Xr ifconfig 8 ,
+or through the
+.Dv SIOCSPEER
+.Xr ioctl 2 .
+.Pp
CARP virtual hosts can be configured on multicast-capable interfaces: Ethernet,
layer 2 VLAN, FDDI and Token Ring.
An arbitrary number of virtual host IDs can be configured on an interface.

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