control/controlclient: replace TODO with explanation
@@ -69,7 +69,7 @@ type Client interface {
SetNetInfo(*tailcfg.NetInfo)
// UpdateEndpoints changes the Endpoint structure that will be sent
// in subsequent node registration requests.
- // TODO: localPort seems to be obsolete, remove it.
+ // The localPort field is unused except for integration tests in another repo.
// TODO: a server-side change would let us simply upload this
// in a separate http request. It has nothing to do with the rest of
// the state machine.
