diff --git a/sbin/mdconfig/mdconfig.8 b/sbin/mdconfig/mdconfig.8
index 1988b3e31710..7c053dd148fc 100644
--- a/sbin/mdconfig/mdconfig.8
+++ b/sbin/mdconfig/mdconfig.8
@@ -131,7 +131,7 @@ See description of
 .Fl y 
 below.
 .It Fl y Ar heads/cylinder
-For malloc backed devices, the
+For malloc or vnode backed devices, the
 .Fl x
 and
 .Fl y