-None. At the moment, ngIRCd supports the "CAP" command and its sub-commands
-but offers no capabilities that could be requested by a client.
+* "multi-prefix"
+
+ When requested, the multi-prefix client capability will cause the IRC
+ server to send all possible prefixes which apply to a user in NAMES and
+ WHO output.
+
+ See <http://ircv3.atheme.org/extensions/multi-prefix-3.1>.