code: func (msg *MsgPong) MaxPayloadLength(pver uint32) uint32 {
  	plen := uint32(0)
  	// The pong message did not exist for BIP0031Version and earlier.
  	// NOTE: > is not a mistake here.  The BIP0031 was defined as AFTER
  	// the version unlike most others.
  	if pver > BIP0031Version {
  		// Nonce 8 bytes.
  		plen += 8
  	}
  
  	return plen
  }
docs: // MaxPayloadLength returns the maximum length the payload can be for the
  // receiver.  This is part of the Message interface implementation.