I use imported json files of canned data for my continuous integration suite and unit testing. It would be very handy to allow comment lines in this file so I remember what each chunk of data is supporting. Something ridiculously simple like a '#' character in the first position of a line is ignored by the import engine, etc.

Example:

1. Test Suite 1 { "foo":"bar" }

1. Test Suite 2 { "hey":"you" }