--- a/ontology/ProvenanceOntology.owl	Thu Feb 23 22:55:34 2012 -0500
+++ b/ontology/ProvenanceOntology.owl	Fri Feb 24 00:00:24 2012 -0500
@@ -624,6 +624,7 @@
     <owl:Class rdf:about="&prov;End">
         <rdfs:subClassOf rdf:resource="&prov;Association"/>
         <rdfs:subClassOf rdf:resource="&prov;InstantaneousEvent"/>
+        <rdfs:comment>An Agent ends an Activity, optionally at a particular TimeInstant.</rdfs:comment>
         <rdfs:seeAlso rdf:resource="http://www.w3.org/2011/prov/wiki/ProvRDF#Ending"/>
     </owl:Class>
     
@@ -786,6 +787,7 @@
     <owl:Class rdf:about="&prov;Start">
         <rdfs:subClassOf rdf:resource="&prov;Association"/>
         <rdfs:subClassOf rdf:resource="&prov;InstantaneousEvent"/>
+        <rdfs:comment>An Agent starts an Activity, optionally at a particular TimeInstant.</rdfs:comment>
         <rdfs:seeAlso rdf:resource="http://www.w3.org/2011/prov/wiki/ProvRDF#Starting"/>
     </owl:Class>