@@ -374,9 +374,12 @@ intended recipient of the packet, and so gets ready to forward it to
374374checksum with the new, and then sends the packet along to `~worwel-sipnum`.
375375
376376Once `~worwel-sipnum` processes the packet, it will know the IP and port of
377−`~bacbel-tagfeb` since `~zod` included it when it forwarded the packet and so
378−will send an ack packet directly to `~bacbel-tagfeb`. Communication between the
379−two ships will now be direct until one of them changes their IP address, port, or networking keys.
377+`~bacbel-tagfeb` since `~zod` included it when it forwarded the packet. Thus
378+`~worwel-sipnum` will send an ack packet directly to `~bacbel-tagfeb`, unless a
379+NAT and/or firewall prevents a direct peer-to-peer connection, in which case
380+`~zod` will contineu to relay packets. Absent these factors preventing a
381+peer-to-peer connection, communication between the two ships will now be direct
382+until one of them changes their IP address, port, or networking keys.
380383
381384
382385## The Serf and the King