Automatic notifications and subscriptions to document approval/rejection comments

Currently, only the document submitter receives notification of a document reviewer's comment. Comments are then monitored by the document submitter in the document updates area. Any comments we want the entire document approval committee to read have to be copied into a new update with notification to the approval committee. We would like for everyone in the document approval list (as well as anyone we'd like to subscribe) to be automatically notified of a document reviewer's comment.