Index: sbin/fsck_ffs/fsck_ffs.8
===================================================================
--- sbin/fsck_ffs/fsck_ffs.8
+++ sbin/fsck_ffs/fsck_ffs.8
@@ -29,7 +29,7 @@
 .\"	@(#)fsck.8	8.4 (Berkeley) 5/9/95
 .\" $FreeBSD$
 .\"
-.Dd October 5, 2016
+.Dd February 14, 2017
 .Dt FSCK_FFS 8
 .Os
 .Sh NAME
@@ -38,7 +38,7 @@
 .Nd file system consistency check and interactive repair
 .Sh SYNOPSIS
 .Nm
-.Op Fl BEFfnpRryZ
+.Op Fl BCdEFfnpRrSyZ
 .Op Fl b Ar block
 .Op Fl c Ar level
 .Op Fl m Ar mode
@@ -149,6 +149,8 @@
 the file system is marked as needing a foreground check and
 .Nm
 exits without attempting any further cleaning.
+.It Fl d
+Enable debugging messages.
 .It Fl E
 Clear unallocated blocks, notifying the underlying device that they
 are not used and that their contents may be discarded.
Index: sbin/fsck_ffs/main.c
===================================================================
--- sbin/fsck_ffs/main.c
+++ sbin/fsck_ffs/main.c
@@ -670,7 +670,7 @@
 usage(void)
 {
 	(void) fprintf(stderr,
-"usage: %s [-BEFfnpry] [-b block] [-c level] [-m mode] filesystem ...\n",
+"usage: %s [-BCdEFfnpRrSyZ] [-b block] [-c level] [-m mode] filesystem ...\n",
 	    getprogname());
 	exit(1);
 }