diff --git a/siop.c b/siop.c
index 67c38e2..42fc9fd 100644
--- a/siop.c
+++ b/siop.c
@@ -1,4 +1,4 @@
-/*  $NetBSD: siop.c,v 1.70 2019/11/10 21:16:22 chs Exp $ */
+/*	$NetBSD: siop.c,v 1.71 2022/04/07 19:33:37 andvar Exp $ */
 
 /*
  * Copyright (c) 1990 The Regents of the University of California.
@@ -75,7 +75,7 @@
 // #include "opt_ddb.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: siop.c,v 1.70 2019/11/10 21:16:22 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: siop.c,v 1.71 2022/04/07 19:33:37 andvar Exp $");
 
 #include <sys/param.h>
 #if 0
@@ -860,7 +860,7 @@ siop_start(struct siop_softc *sc, int target, int lun, u_char *cbuf, int clen,
     /*
      * Negotiate wide is the initial negotiation state;  since the 53c710
      * doesn't do wide transfers, just begin the synchronous transfer
-     * negotation here.
+     * negotiation here.
      */
     if (sc->sc_sync[target].state == NEG_WIDE) {
         if (siop_inhibit_sync[target]) {
diff --git a/siopreg.h b/siopreg.h
index d24808b..7915e1f 100644
--- a/siopreg.h
+++ b/siopreg.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: siopreg.h,v 1.15 2012/08/24 09:01:22 msaitoh Exp $	*/
+/*	$NetBSD: siopreg.h,v 1.16 2022/06/27 20:28:31 andvar Exp $      */
 
 /*
  * Copyright (c) 1990 The Regents of the University of California.
@@ -470,7 +470,7 @@ typedef volatile siop_regmap_t *siop_regmap_p;
 #define	SIOP_CTEST4_ZMOD	0x40	/* High-impedance outputs */
 #define	SIOP_CTEST4_SZM		0x20	/* ditto, SCSI "outputs" */
 #ifndef ARCH_720
-#define	SIOP_CTEST4_SLBE	0x10	/* SCSI loobpack enable */
+#define	SIOP_CTEST4_SLBE	0x10	/* SCSI loopback enable */
 #define	SIOP_CTEST4_SFWR	0x08	/* SCSI FIFO write enable (from sodl) */
 #else
 #define	SIOP_CTEST4_SRTM	0x10	/* Shadow Register Test Mode */
diff --git a/siopvar.h b/siopvar.h
index 08274ee..2c088a0 100644
--- a/siopvar.h
+++ b/siopvar.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: siopvar.h,v 1.28 2022/01/01 21:07:13 andvar Exp $	*/
+/*	$NetBSD: siopvar.h,v 1.29 2022/04/07 19:33:37 andvar Exp $	*/
 
 /*
  * Copyright (c) 1990 The Regents of the University of California.
@@ -191,10 +191,10 @@ struct	siop_softc {
 
 /* negotiation states */
 #define NEG_WIDE	0	/* Negotiate wide transfers */
-#define	NEG_WAITW	1	/* Waiting for wide negotation response */
+#define	NEG_WAITW	1	/* Waiting for wide negotiation response */
 #define NEG_SYNC	2	/* Negotiate synch transfers */
 #define	NEG_WAITS	3	/* Waiting for synch negoation response */
-#define NEG_DONE	4	/* Wide and/or sync negotation done */
+#define NEG_DONE	4	/* Wide and/or sync negotiation done */
 
 #define	MSG_CMD_COMPLETE	0x00
 #define MSG_EXT_MESSAGE		0x01