Configure org mode archiving

config.org

@@ -199,6 +199,19 @@ needs to be set up to install them if they aren't already.
            (setcdr (assoc "\\.pdf\\'" org-file-apps) "mupdf %s")))
 	#+end_src
 
+** Archival
+   It's nice to be able to clear out old and irrelevant things from
+   task lists, etc. To that end, [[help:org-archive-subtree][org-archive-subtree]] is very nice. To
+   configure where archived items go, we can set [[help:org-archive-location][org-archive-location]]:
+
+   #+begin_src emacs-lisp
+     (setq org-archive-location "%s-archive::datetree/")
+   #+end_src
+
+   The =datetree= bit there is a special option that means archived
+   items will be grouped by the date they were marked =DONE=, or the
+   date they were archived, if that's missing.
+
 * Start up
 
   Org is better suited as scratch space than Funamental, I'd say.