diff --git a/src/cco-modules/AgentOntology.ttl b/src/cco-modules/AgentOntology.ttl
index 6e9dc37..55b7a3b 100644
--- a/src/cco-modules/AgentOntology.ttl
+++ b/src/cco-modules/AgentOntology.ttl
@@ -826,7 +826,7 @@ cco:ont00001943 rdf:type owl:ObjectProperty ;
                  rdfs:domain cco:ont00001262 ;
                  rdfs:range cco:ont00001262 ;
                  rdfs:label "supervises"@en ;
-                 skos:definition "A person p1 supervises a person p2 by virtue of p1 directing, managing, or overseeing p2."@en ;
+                 skos:definition "x supervises y iff x and y are both instances of Person and x directs, manages, or oversees y."@en ;
                  cco:ont00001754 "http://en.wiktionary.org/wiki/supervise" ;
                  cco:ont00001760 "https://www.commoncoreontologies.org/AgentOntology"^^xsd:anyURI .