diff --git a/catgirl.1 b/catgirl.1
index fb2a454..3b84969 100644
--- a/catgirl.1
+++ b/catgirl.1
@@ -594,6 +594,14 @@ join = #ascii.town
 .It
 .Rs
 .%A William Pitcock
+.%T IRCv3.1 multi-prefix Extension
+.%I IRCv3 Working Group
+.%U https://ircv3.net/specs/extensions/multi-prefix-3.1
+.Re
+.
+.It
+.Rs
+.%A William Pitcock
 .%A Jilles Tjoelker
 .%T IRCv3.1 SASL Authentication
 .%I IRCv3 Working Group
diff --git a/chat.h b/chat.h
index 9976786..bb15b3d 100644
--- a/chat.h
+++ b/chat.h
@@ -72,6 +72,7 @@ static inline enum Color hash(const char *str) {
 #define ENUM_CAP \
 	X("extended-join", CapExtendedJoin) \
 	X("invite-notify", CapInviteNotify) \
+	X("multi-prefix", CapMultiPrefix) \
 	X("sasl", CapSASL) \
 	X("server-time", CapServerTime) \
 	X("userhost-in-names", CapUserhostInNames)