diff --git a/sys/arch/bebox/include/bus.h b/sys/arch/bebox/include/bus.h
index cc4d1053cfa4..4fae98f53df6 100644
--- a/sys/arch/bebox/include/bus.h
+++ b/sys/arch/bebox/include/bus.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: bus.h,v 1.16 1998/09/01 05:57:23 sakamoto Exp $	*/
+/*	$NetBSD: bus.h,v 1.17 1998/10/03 21:24:00 thorpej Exp $	*/
 /*	$OpenBSD: bus.h,v 1.1 1997/10/13 10:53:42 pefo Exp $	*/
 
 /*-
@@ -1060,6 +1060,7 @@ struct bebox_bus_dmamap {
 	int		_dm_segcnt;	/* number of segs this map can map */
 	bus_size_t	_dm_maxsegsz;	/* largest possible segment */
 	bus_size_t	_dm_boundary;	/* don't cross this */
+	bus_addr_t	_dm_bounce_thresh; /* bounce threshold; see tag */
 	int		_dm_flags;	/* misc. flags */
 
 	void		*_dm_cookie;	/* cookie for bus-specific functions */
diff --git a/sys/arch/i386/include/bus.h b/sys/arch/i386/include/bus.h
index 8a9014b581ab..314d727ef5d8 100644
--- a/sys/arch/i386/include/bus.h
+++ b/sys/arch/i386/include/bus.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: bus.h,v 1.21 1998/08/30 23:40:14 cgd Exp $	*/
+/*	$NetBSD: bus.h,v 1.22 1998/10/03 21:24:00 thorpej Exp $	*/
 
 /*-
  * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
@@ -1073,6 +1073,7 @@ struct i386_bus_dmamap {
 	int		_dm_segcnt;	/* number of segs this map can map */
 	bus_size_t	_dm_maxsegsz;	/* largest possible segment */
 	bus_size_t	_dm_boundary;	/* don't cross this */
+	bus_addr_t	_dm_bounce_thresh; /* bounce threshold; see tag */
 	int		_dm_flags;	/* misc. flags */
 
 	void		*_dm_cookie;	/* cookie for bus-specific functions */
diff --git a/sys/arch/macppc/include/bus.h b/sys/arch/macppc/include/bus.h
index 4864e282b9df..739dd9fc7aea 100644
--- a/sys/arch/macppc/include/bus.h
+++ b/sys/arch/macppc/include/bus.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: bus.h,v 1.4 1998/08/21 16:13:28 tsubai Exp $	*/
+/*	$NetBSD: bus.h,v 1.5 1998/10/03 21:24:00 thorpej Exp $	*/
 /*	$OpenBSD: bus.h,v 1.1 1997/10/13 10:53:42 pefo Exp $	*/
 
 /*-
@@ -863,6 +863,7 @@ struct macppc_bus_dmamap {
 	int		_dm_segcnt;	/* number of segs this map can map */
 	bus_size_t	_dm_maxsegsz;	/* largest possible segment */
 	bus_size_t	_dm_boundary;	/* don't cross this */
+	bus_addr_t	_dm_bounce_thresh; /* bounce threshold; see tag */
 	int		_dm_flags;	/* misc. flags */
 
 	void		*_dm_cookie;	/* cookie for bus-specific functions */