--- a/ontology/ProvenanceOntology.owl	Thu Feb 23 22:49:26 2012 -0500
+++ b/ontology/ProvenanceOntology.owl	Thu Feb 23 22:52:40 2012 -0500
@@ -623,6 +623,7 @@
 
     <owl:Class rdf:about="&prov;End">
         <rdfs:subClassOf rdf:resource="&prov;Association"/>
+        <rdfs:subClassOf rdf:resource="&prov;Timed"/>
         <rdfs:seeAlso rdf:resource="http://www.w3.org/2011/prov/wiki/ProvRDF#Ending"/>
     </owl:Class>
     
@@ -778,6 +779,7 @@
 
     <owl:Class rdf:about="&prov;Start">
         <rdfs:subClassOf rdf:resource="&prov;Association"/>
+        <rdfs:subClassOf rdf:resource="&prov;Timed"/>
         <rdfs:seeAlso rdf:resource="http://www.w3.org/2011/prov/wiki/ProvRDF#Starting"/>
     </owl:Class>