diff --git a/sys/sys/reboot.h b/sys/sys/reboot.h
index f3cd91e3b4bb..fbb7e6d79fc8 100644
--- a/sys/sys/reboot.h
+++ b/sys/sys/reboot.h
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)reboot.h	8.1 (Berkeley) 6/2/93
- * $Id: reboot.h,v 1.7 1994/11/26 09:08:40 phk Exp $
+ * $Id: reboot.h,v 1.8 1995/01/20 07:28:47 wpaul Exp $
  */
 
 #ifndef _SYS_REBOOT_H_
@@ -58,6 +58,8 @@
 #define RB_VERBOSE	0x800	/* print all potentially useful info */
 #define	RB_SERIAL	0x1000	/* user serial port as console */
 
+#define	RB_BOOTINFO	0x80000000	/* have `struct bootinfo *' arg */
+
 /*
  * Constants for converting boot-style device number to type,
  * adaptor (uba, mba, etc), unit number and partition number.