diff --git a/usr.sbin/config/config.5 b/usr.sbin/config/config.5
index dd3ee8baffee..433194f3b22b 100644
--- a/usr.sbin/config/config.5
+++ b/usr.sbin/config/config.5
@@ -402,18 +402,6 @@ Options specific to architecture
 are specified in the file
 .Pa sys/conf/options . Ns Aq Ar arch .
 .El
-.Ss Obsolete Directives
-The following kernel configuration directives are obsolete.
-.Bl -tag -width indent
-.\" -------- CONFIG --------
-.It Ic config
-This directive was used to specify the device to be used for the root
-file system.
-From
-.Fx 4.0
-onwards, this information is passed to a booting kernel by
-.Xr loader 8 .
-.El
 .Sh FILES
 .Bl -tag -width ".Pa sys/conf/Makefile. Ns Ar arch" -compact
 .It Pa sys/compile/ Ns Ar NAME
diff --git a/usr.sbin/config/config.y b/usr.sbin/config/config.y
index 3d517c2b789e..0ffeb653d722 100644
--- a/usr.sbin/config/config.y
+++ b/usr.sbin/config/config.y
@@ -203,15 +203,6 @@ Config_spec:
 		STAILQ_INSERT_HEAD(&hints, hint, hint_next);
 	        }
 
-System_spec:
-	CONFIG System_id System_parameter_list {
-		errx(1, "%s:%d: root/dump/swap specifications obsolete",
-		      yyfile, yyline);
-		}
-	  |
-	CONFIG System_id
-	  ;
-
 System_id:
 	Save_id { newopt(&mkopt, ns("KERNEL"), $1, 0, 0); };
 
diff --git a/usr.sbin/config/lang.l b/usr.sbin/config/lang.l
index f83af3b5d9cc..ed0b2aa794b3 100644
--- a/usr.sbin/config/lang.l
+++ b/usr.sbin/config/lang.l
@@ -62,7 +62,6 @@ struct kt {
 	const char *kt_name;
 	int kt_val;
 } key_words[] = {
-	{ "config",	CONFIG },
 	{ "cpu",	CPU },
 	{ "nocpu",	NOCPU },
 	{ "device",	DEVICE },