diff --git a/src/cco-extensions/ModalRelationOntology.ttl b/src/cco-extensions/ModalRelationOntology.ttl
index 36c64e2..efe0835 100644
--- a/src/cco-extensions/ModalRelationOntology.ttl
+++ b/src/cco-extensions/ModalRelationOntology.ttl
@@ -2394,7 +2394,7 @@ mro:ont00001943 rdf:type owl:ObjectProperty ;
                 rdfs:domain cco:ont00001262 ;
                 rdfs:range cco:ont00001262 ;
                 rdfs:label "supervises"@en ;
-                <http://www.w3.org/2004/02/skos/core#definition> "A person p1 supervises a person p2 by virtue of p1 directing, managing, or overseeing p2."@en ;
+                <http://www.w3.org/2004/02/skos/core#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/ModalRelationOntology> .