--- a/ontology/components/assumedBy/appending-a-file-to-itself.ttl	Mon Sep 19 16:28:15 2011 -0400
+++ b/ontology/components/assumedBy/appending-a-file-to-itself.ttl	Mon Sep 19 16:33:30 2011 -0400
@@ -20,8 +20,9 @@
       dcterms:modified "2011-09-12T16:00:00-04:00"^^xsd:dateTime;
    ];
    prov:used [
-      a prov:Controller;
+      a prov:Controller; # prov:Controller is subclass of prov:Role .
       prov:assumedBy <http://tw.rpi.edu/instances/TimLebo>;
+      rdfs:seeAlso <https://dvcs.w3.org/hg/prov/file/tip/ontology/components/Controller.ttl>;
    ];
    prov:used [
       a :Output; # and by subsumption, also a prov:Role, prov:Entity;