diff --git a/sbin/route/route.8 b/sbin/route/route.8
index ff751895d536..65a1de166071 100644
--- a/sbin/route/route.8
+++ b/sbin/route/route.8
@@ -71,6 +71,10 @@ when reporting actions.
 names and numerical equivalents can be quite time consuming, and
 may require correct operation of the network; thus it may be expedient
 to forget this, especially when attempting to repair networking operations).
+.It Fl t
+Run in test-only mode.
+.Pa /dev/null
+is used instead of a socket.
 .It Fl v
 (verbose) Print additional details.
 .It Fl q