diff --git a/usr.sbin/asf/asf.8 b/usr.sbin/asf/asf.8
index 39281375417b..62ecdca15a76 100644
--- a/usr.sbin/asf/asf.8
+++ b/usr.sbin/asf/asf.8
@@ -37,6 +37,15 @@
 .Op Fl o Ar outfile
 .Op Fl X Ar suffix
 .Op Ar modules-path Op Ar outfile
+.Sh DEPRECATION NOTICE
+The
+.Nm
+utility is not present in
+.Fx 12.0
+and later.
+The
+.Xr kgdb 1
+debugger handles kernel module state internally.
 .Sh DESCRIPTION
 By default,
 .Nm