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diff --git a/share/man/man4/multicast.4 b/share/man/man4/multicast.4
--- a/share/man/man4/multicast.4
+++ b/share/man/man4/multicast.4
@@ -23,7 +23,7 @@
.\" FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
.\" DEALINGS IN THE SOFTWARE.
.\"
-.Dd May 27, 2009
+.Dd February 13, 2026
.Dt MULTICAST 4
.Os
.\"
@@ -124,15 +124,15 @@
routing socket should be reused for IGMP and MLD messages as well.
.Pp
After the multicast routing socket is open, it can be used to enable
-or disable multicast forwarding in the kernel:
+multicast forwarding in the kernel:
.Bd -literal
/* IPv4 */
-int v = 1; /* 1 to enable, or 0 to disable */
+int v = 1;
setsockopt(mrouter_s4, IPPROTO_IP, MRT_INIT, (void *)&v, sizeof(v));
.Ed
.Bd -literal
/* IPv6 */
-int v = 1; /* 1 to enable, or 0 to disable */
+int v = 1;
setsockopt(mrouter_s6, IPPROTO_IPV6, MRT6_INIT, (void *)&v, sizeof(v));
\&...
/* If necessary, filter all ICMPv6 messages */
@@ -142,6 +142,24 @@
sizeof(filter));
.Ed
.Pp
+When applied to the multicast routing socket, the
+.Dv MRT_DONE
+and
+.Dv MRT6_DONE
+socket options disable multicast forwarding in the kernel:
+.Bd -literal
+/* IPv4 */
+int v = 1;
+setsockopt(mrouter_s4, IPPROTO_IP, MRT_DONE, (void *)&v, sizeof(v));
+.Ed
+.Bd -literal
+/* IPv6 */
+int v = 1;
+setsockopt(mrouter_s6, IPPROTO_IPV6, MRT6_DONE, (void *)&v, sizeof(v));
+.Ed
+.Pp
+Closing the socket has the same effect.
+.Pp
After multicast forwarding is enabled, the multicast routing socket
can be used to enable PIM processing in the kernel if we are running PIM-SM or
PIM-DM

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