Add another advantage

proposals/2778-appservice-login.md

@@ -11,6 +11,10 @@ which means bridge users need to be able to generate a device on demand. In the
 have used the bridge bot's device for all bridge users in the room, but this causes problems should the bridge
 wish to only join ghosts to a room (e.g. for DMs).
 
+Another advantage this provides is that an appservice can now be used to generate access tokens for
+any user in it's namespace without having to set a password for that user, which may be useful in the
+case of software where maintaining password(s) in the configuration is undesirable.
+
 ## Proposal
 
 A new `type` is to be added to `POST /login`.