diff --git a/doc/master/receive_udp b/doc/master/receive_udp
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+SYNOPSIS
+	void receive_udp(string host, string msg, int hostport)
+
+DESCRIPTION
+	Handle a received IMP message.
+
+	This function is called for every message received on the IMP
+	port. Usually it is passed on to some object that handles
+	inter mud communications.
+
+HISTORY
+	The 'hostport' argument was added in 3.2.1.
+
+SEE ALSO
+	send_udp(E), query_udp_port(E)
+
+29.10.2006 Zesstra