[[!comment format=mdwn
 username="joey"
 subject="""comment 1"""
 date="2015-07-20T16:19:15Z"
 content="""
--file=subdir/foo will work, assuming subdir already exists.

If the goal is just to add whatever filename addurl comes up with by
default to a subdirectory, why not just `cd` to that subdir before
running addurl?
"""]]