It would be helpful if there were a discussion feed associated with a document, perhaps something in a side panel of the document viewer. Something like a chat feed, where users who have access to the document can add conversation entries. This would be great in workflows where documents may get passed back and forth. The chat feed would exist outside of the document, rather than text annotations on top of the document. This would also be easier than trying to pass messages back and forth in workflow using index values.