Destination Address of nRF24L01+ Auto ACK Packet

Projects Programming
1

So, I just posted this over on Nordic's DevZone, but thought someone in the larger audience here might know the answer.

As far as I can tell, the packet sent by nRF24L01+ PTX only contains a destination address. There is no information that identifies the transmitter (i.e. PTX).

So, when the PRX receives the packet, what does it use for the destination address of its Auto ACK packet? And, what address is the PTX now listening for to get this Auto ACK packet?

Thanks.