diff --git a/sys/sys/reboot.h b/sys/sys/reboot.h
index 333950aa401a..dd848999b148 100644
--- a/sys/sys/reboot.h
+++ b/sys/sys/reboot.h
@@ -35,7 +35,7 @@
  */
 
 #ifndef _SYS_REBOOT_H_
-#define _SYS_REBOOT_H_
+#define	_SYS_REBOOT_H_
 
 /*
  * Arguments to reboot system call.  These are passed to
@@ -53,18 +53,17 @@
 #define	RB_RDONLY	0x080	/* mount root fs read-only */
 #define	RB_DUMP		0x100	/* dump kernel memory before reboot */
 #define	RB_MINIROOT	0x200	/* mini-root present in memory at boot time */
-#define RB_CONFIG	0x400	/* invoke user configuration routing */
-#define RB_VERBOSE	0x800	/* print all potentially useful info */
-#define	RB_SERIAL	0x1000	/* user serial port as console */
+#define	RB_CONFIG	0x400	/* invoke user configuration routing */
+#define	RB_VERBOSE	0x800	/* print all potentially useful info */
+#define	RB_SERIAL	0x1000	/* use serial port as console */
 #define	RB_CDROM	0x2000	/* use cdrom as root */
-#define	RB_POWEROFF	0x4000	/* if you can, turn the power off */
+#define	RB_POWEROFF	0x4000	/* turn the power off if possible */
 #define	RB_GDB		0x8000	/* use GDB remote debugger instead of DDB */
-#define	RB_MUTE		0x10000	/* Come up with the console muted */
-#define	RB_SELFTEST	0x20000	/* don't boot to normal operation, do selftest */
-#define	RB_PAUSE	0x40000 /* pause after each output line during probe */
-#define	RB_MULTIPLE	0x20000000	/* Use multiple consoles */
+#define	RB_MUTE		0x10000	/* start up with the console muted */
+#define	RB_SELFTEST	0x20000	/* don't complete the boot; do selftest */
+#define	RB_PAUSE	0x40000	/* pause after each output line during probe */
+#define	RB_MULTIPLE	0x20000000	/* use multiple consoles */
 
 #define	RB_BOOTINFO	0x80000000	/* have `struct bootinfo *' arg */
 
-
-#endif
+#endif /* !_SYS_REBOOT_H_ */