typo again ;)

README.md

@@ -54,7 +54,7 @@ NOTE: All 'value' transporting binary or UTF-8 data is represented as base64.
 * metric: a 32 bits unsigned integer representing the sum of all latencies between the client and the announcing client. An originating client will set a random value between 1000 and 2000 to avoid localisation.
 * msgid: a uuid defining a message unique to a chatid.
 * mtype: A closed supported list of media types {text, png, jpeg, gif, webm, vcard, ??} (text is always UTF-8)
-* neighbour: ipv4,port\[,ipv4\] (IPv4 can be optionally disclosed)
+* neighbour: ipv6,port\[,ipv4\] (IPv4 can be optionally disclosed)
 * nickname: the nickname chosen by the client (UTF-8 string).
 * nodekey: the public key of the sending node.
 * nonce: random bytes, also known as initialisation vector. Must be new for every message.