filter-operator-between-entries documentation?

In “/tool sniffer” there is parameter called “filter-operator-between-entries”
that can be set to values: “or”, “and”.

Where is documentation or detailed description of this parameter?

I have not found it on
https://wiki.mikrotik.com/wiki/Manual:Tools/Packet_Sniffer

Thank you!
Piotr Kasprzyk