Is there a way to indicate a bug report has been updated?

I submitted a bug report and got a quick response asking me to provide some more information and attach it to the report. As far as I can tell, the only way to do that is to make a comment and attach the file there. Is that correct? I have done that, but the bug status has been "Waiting on reporter" for a month now. Is there something I need to do to indicate that I have submitted the requested information? The bug report in question is