Is there a way to add a comment to packets in command line?

Question

I was reading this wireshark user guide and found that you can add comments to a pcapng capture file, but so far I haven't been able to do it, I tried everything but nothing seems to work, can someone explain me how to do it?

bash $ tshark -r e.pcapng -comment hey

tshark: The specified packet count "omment" isn't a decimal number

This is the part of the page that shows that it is possible:

capture-comment <comment>

add a capture comment to the newly created

output file (only for pcapng)

Accepted Answer

Looks like you cannot add comments to existing files. I just tried, and this is what happenend:

[D:\Traces]tshark -r "HTTP Sample Test.pcapng" --capture-comment "Test for Q&A" -w "HTTP Sample Test commented.pcapng" tshark: A capture comment was specified, but a capture isn't being done. There's no support for adding a capture comment to an existing capture file.

[D:\Traces]

Answer 2

although not on the command line, you can do it in Wireshark

Statistics -> Summary -> Capture File Comments

If you save the file, the comments will be added to the pcapgng file.

Regards
Kurt