diff --git a/sbin/mdconfig/mdconfig.8 b/sbin/mdconfig/mdconfig.8
index 230471cfab3b..6d9da8159723 100644
--- a/sbin/mdconfig/mdconfig.8
+++ b/sbin/mdconfig/mdconfig.8
@@ -127,7 +127,7 @@ Filename to use for the vnode type memory disk.
 The
 .Fl a
 and
-.Fl t Ar vnode
+.Fl t Cm vnode
 options are implied if not specified.
 .It Fl l
 List configured devices.
@@ -170,7 +170,7 @@ When used without the
 option, the
 .Fl a
 and
-.Fl t Ar swap
+.Fl t Cm swap
 options are implied if not specified.
 .It Fl S Ar sectorsize
 Sectorsize to use for the memory disk, in bytes.
@@ -272,7 +272,7 @@ The last form,
 is provided for convenience as an abbreviation of
 .Nm
 .Fl a
-.Fl t Ar vnode
+.Fl t Cm vnode
 .Fl f Ar file .
 .Sh EXAMPLES
 Create a disk with