Index: head/share/man/man4/ubsec.4
===================================================================
--- head/share/man/man4/ubsec.4
+++ head/share/man/man4/ubsec.4
@@ -48,6 +48,15 @@
 .Bd -literal -offset indent
 ubsec_load="YES"
 .Ed
+.Sh DEPRECATION NOTICE
+The
+.Nm
+driver is not present in
+.Fx 13.0
+and later.
+The majority of crypto algorithms supported by this driver are no longer
+used by the kernel in
+.Fx 13.0 .
 .Sh DESCRIPTION
 The
 .Nm
Index: head/sys/dev/ubsec/ubsec.c
===================================================================
--- head/sys/dev/ubsec/ubsec.c
+++ head/sys/dev/ubsec/ubsec.c
@@ -472,6 +472,7 @@
 		crypto_kregister(sc->sc_cid, CRK_MOD_EXP_CRT, 0);
 #endif
 	}
+	gone_in_dev(dev, 13, "Does not support modern crypto algorithms");
 	return (0);
 bad4:
 	while (!SIMPLEQ_EMPTY(&sc->sc_freequeue)) {