--- a/ontology/ProvenanceOntology.owl	Mon Jun 18 00:33:46 2012 -0700
+++ b/ontology/ProvenanceOntology.owl	Mon Jun 18 00:38:24 2012 -0700
@@ -1241,6 +1241,7 @@
 
     <owl:DatatypeProperty rdf:about="http://www.w3.org/ns/prov#pairKey">
         <rdf:type rdf:resource="&owl;FunctionalProperty"/>
+        <definition xml:lang="en">The key with which an Entity has been inserted into a prov:Dictionary; a key is expected to be unique within each prov:Dictionary.</definition>
         <category>collections</category>
         <component>collections</component>
         <rdfs:comment xml:lang="en">The key of a KeyValuePair, which is an element of a prov:Dictionary. See also prov:pairValue.</rdfs:comment>

--- a/ontology/prov.ttl	Mon Jun 18 00:33:46 2012 -0700
+++ b/ontology/prov.ttl	Mon Jun 18 00:38:24 2012 -0700
@@ -866,7 +866,8 @@
     rdfs:domain :KeyValuePair ;
     rdfs:range rdfs:Literal ;
     :category "collections" ;
-    :component "collections" .
+    :component "collections" ;
+    :definition "The key with which an Entity has been inserted into a prov:Dictionary; a key is expected to be unique within each prov:Dictionary."@en .
 
 :pairValue
     a owl:FunctionalProperty, owl:ObjectProperty ;