# Revision history [back]

Those are generated fields created by Wireshark when the capture is read in.

doc/README.dissector:
proto_item_set_generated()
--------------------------
proto_item_set_generated is used to mark fields as not being read from the
captured data directly, but inferred from one or more values.


They are set in packet-tcp.c

     /* encapsulate all proto_tree_add_xxx in ifs so we only print what
data we actually have */
if(ta->frame_acked) {