Add a comment to Router's Start method

router/router.go

@@ -72,6 +72,8 @@ func NewRouter(config RouterConfig, name PeerName, nickName string) *Router {
 	return router
 }
 
+// Start listening for packets from containers, TCP connections and
+// packets forwarded over UDP.
 func (router *Router) Start() {
 	// we need two pcap handles since they aren't thread-safe
 	var pio PacketSourceSink