Adding a DOCman document but without the need for a file

Hi, in some cases we want to be able to have a document in DOCman available to view, but it doesn't need a file attached to it, i.e. the document itself is information available to site visitors with the right permissions, but no download is needed.

DOCman seems to enforce adding a file when saving a new document, but how can this be optional rather than required?

Thanks in advance.

Peter