diff --git a/sbin/mdconfig/mdconfig.8 b/sbin/mdconfig/mdconfig.8
index f6d0aee098ae..264532721531 100644
--- a/sbin/mdconfig/mdconfig.8
+++ b/sbin/mdconfig/mdconfig.8
@@ -209,7 +209,7 @@ Enable/disable compression features to reduce memory usage.
 Disable/enable extra sanity checks to prevent the user from doing something
 that might adversely affect the system.
 This can be used with the
-.Fl u
+.Fl d
 flag to forcibly destroy an
 .Xr md 4
 disk that is still in use.