def archive_done(
            self):
        """*move done tasks from the document's 'Archive' project into an adjacent markdown tasklog file*

        **Usage:**

            To move the archived tasks within a workspace's taskpaper docs into ``-tasklog.md`` files use the ``archive_done()`` method:

            .. code-block:: python 

                ws.archive_done()
        """
        self.log.info('starting the ``archive_done`` method')

        for f in self.taskpaperFiles:
            self._archive_tp_file_done_tasks(f)

        self.log.info('completed the ``archive_done`` method')
        return None