+.It Fl x
+The
+.Fl x
+option tells rpc.lockd how long to cache state records for contacting
+client
+.Xr rpc.statd 8
+implementations. Setting it to zero will disable the cache which will
+make lock and unlock requests from a single client more expensive because
+of additional interaction with the client's statd. The default cache time
+is 60 seconds.