The one time I played with adding a comment to a .zip file, I used 7-Zip. Basically, open the .zip file with 7-Zip, either use ctrl-Z or Comment from the file menu, copy/paste the comment and close the file. That was a simple text file with instructions on using the command line options for the installer stored in the .zip file.
I'm not sure what the format for a CBZ/CBR comment is so you may have to do some editing to get the right format.
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