http://www.rfc-editor.org/rfc/rfc7220.txt
RFC 7220: Description Option for the Port Control Protocol (PCP), M. Boucadair, R. Penno, D. Wing2014-05-01T23:00:00-00:00This document extends the Port Control Protocol (PCP) with the ability to associate a description with a PCP-instantiated mapping. It does this by defining a new DESCRIPTION option.