diff --git a/share/man/man4/ddb.4 b/share/man/man4/ddb.4
index ab05061d7171..f54d06c5ab53 100644
--- a/share/man/man4/ddb.4
+++ b/share/man/man4/ddb.4
@@ -1,4 +1,4 @@
-.\"	$NetBSD: ddb.4,v 1.113 2008/05/02 18:11:05 martin Exp $
+.\"	$NetBSD: ddb.4,v 1.114 2008/05/23 17:01:32 tsutsui Exp $
 .\"
 .\" Copyright (c) 1997 - 2007 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -56,7 +56,7 @@
 .\" any improvements or extensions that they make and grant Carnegie Mellon
 .\" the rights to redistribute these changes.
 .\"
-.Dd February 18, 2008
+.Dd May 23, 2008
 .Dt DDB 4
 .Os
 .Sh NAME
@@ -1045,6 +1045,8 @@ Given a trap frame address, print out the trap frame.
 .El
 .Ss MIPS
 .Bl -tag -width "traptrace" -compact
+.It Ic cp0
+Dump CP0 (coprocessor 0) register values.
 .It Ic kvtop
 Print the physical address for a given kernel virtual address.
 .It Ic tlb
diff --git a/sys/arch/mips/mips/db_interface.c b/sys/arch/mips/mips/db_interface.c
index 2c38774d946b..3b5dd2bcb1df 100644
--- a/sys/arch/mips/mips/db_interface.c
+++ b/sys/arch/mips/mips/db_interface.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: db_interface.c,v 1.63 2007/10/17 19:55:37 garbled Exp $	*/
+/*	$NetBSD: db_interface.c,v 1.64 2008/05/23 17:01:32 tsutsui Exp $	*/
 
 /*
  * Mach Operating System
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: db_interface.c,v 1.63 2007/10/17 19:55:37 garbled Exp $");
+__KERNEL_RCSID(0, "$NetBSD: db_interface.c,v 1.64 2008/05/23 17:01:32 tsutsui Exp $");
 
 #include "opt_cputype.h"	/* which mips CPUs do we support? */
 #include "opt_ddb.h"
@@ -542,9 +542,16 @@ db_cp0dump_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
 }
 
 const struct db_command db_machine_command_table[] = {
-	{ DDB_ADD_CMD("kvtop",	db_kvtophys_cmd,	0,	NULL,NULL,NULL) },
-	{ DDB_ADD_CMD("tlb",	db_tlbdump_cmd,		0,	NULL,NULL,NULL) },
-	{ DDB_ADD_CMD("cp0",	db_cp0dump_cmd,		0,	NULL,NULL,NULL) },
+	{ DDB_ADD_CMD("cp0",	db_cp0dump_cmd,		0,
+		"Dump CP0 registers.",
+		NULL, NULL) },
+	{ DDB_ADD_CMD("kvtop",	db_kvtophys_cmd,	0,
+		"Print the physical address for a given kernel virtual address",
+		"address", 
+		"   address:\tvirtual address to look up") },
+	{ DDB_ADD_CMD("tlb",	db_tlbdump_cmd,		0,
+		"Print out TLB entries. (only works with options DEBUG)",
+		NULL, NULL) },
 	{ DDB_ADD_CMD(NULL,     NULL,               0,  NULL,NULL,NULL) }
 };
 #endif	/* !KGDB */