diff --git a/usr.bin/top/top.1 b/usr.bin/top/top.1
--- a/usr.bin/top/top.1
+++ b/usr.bin/top/top.1
@@ -6,10 +6,10 @@
 .Nd display and update information about the top cpu processes
 .Sh SYNOPSIS
 .Nm
-.Op Fl abCHIijnPpqSTtuvxz
+.Op Fl abCHIijnPqSTtuvwz
 .Op Fl d Ar count
 .Op Fl J Ar jail
-.Op Fl m Ar mode
+.Op Fl m Ar cpu | io
 .Op Fl o Ar field
 .Op Fl p Ar pid
 .Op Fl s Ar time
diff --git a/usr.bin/top/top.c b/usr.bin/top/top.c
--- a/usr.bin/top/top.c
+++ b/usr.bin/top/top.c
@@ -463,7 +463,7 @@
 
 	      default:
 		errx(1, 
-"[-abCHIijnPqStuvwz] [-d count] [-J jail] [-m cpu | io] [-o field]\n"
+"[-abCHIijnPqSTtuvwz] [-d count] [-J jail] [-m cpu | io] [-o field]\n"
 "     [-p pid] [-s time] [-U username] [number]");
 	    }
 	}