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AutoResponse

-                      v20
+                      v21
 This example configures the PHY to automatically transmit an ACK packet whenever a DATA packet is received whose destination address matches the local node's address. This is the usual behavior of protocols like Aloha and CSMA. Notice that all other MAC behaviors, like random backoffs and re-transmissions, are handled by the MAC implementation in C (not included here).
+This example uses a temlate ACK packet ({{{templatePkt}}}), stored in a PHY packet buffer ({{{pktBuf_tx_ACK}}}). This template specifies header fields which are not read from the received packet header (i.e. header fields not overwritten by the header translator).
 {{{
 #!C
 …
 This example configures the PHY to automatically re-transmit received DATA packets, overwriting the source MAC address with the node's own address.
+Note that the actor is configured to transmit from the same packet buffer where the PHY wrote the received packet. This eliminates the need for a template packet header, as the transmitted header will match the received header except where the header translator overwrites values.
 {{{
 #!C