|  1 |    initial version    |  
It is possible to add multiple comments to a frame with editcap, but each additional comment must be added as new editcap command.
% tshark -V -r my.pcapng 
Frame 1: 1399 bytes on wire (11192 bits), 1399 bytes captured (11192 bits) on interface eth0, id 0
 ...
% editcap -a "1:My 1st comment for frame 1" my.pcapng my.pcapng-1
% editcap -a "1:My 2nd comment for frame 1" my.pcapng-1 my.pcapng-2
% tshark -V -r my.pcapng-2         
Packet comments
    My 1st comment for frame 1
        [Expert Info (Comment/Comment): My 1st comment for frame 1]
            [My 1st comment for frame 1]
            [Severity level: Comment]
            [Group: Comment]
    My 2nd comment for frame 1
        [Expert Info (Comment/Comment): My 2nd comment for frame 1]
            [My 2nd comment for frame 1]
            [Severity level: Comment]
            [Group: Comment]
Frame 1: 1399 bytes on wire (11192 bits), 1399 bytes captured (11192 bits) on interface eth0, id 0
...