diff --git a/src/cco-modules/AgentOntology.ttl b/src/cco-modules/AgentOntology.ttl
index b59b773..72b0087 100644
--- a/src/cco-modules/AgentOntology.ttl
+++ b/src/cco-modules/AgentOntology.ttl
@@ -274,7 +274,7 @@ cco:ont00001815 rdf:type owl:ObjectProperty ;
                  rdfs:domain cco:ont00001180 ;
                  rdfs:range cco:ont00001180 ;
                  rdfs:label "is subsidiary of"@en ;
-                 skos:definition "An Organization o2 is_subsidiary_of Organization o1 iff o1 controls o2 by having the capacity to determine the outcome of decisions about o2's financial and operating policies. "@en ;
+                 skos:definition "x is_subsidiary_of y iff x and y are both instances of Organization and y controls x by having the capacity to determine the outcome of decisions about the financial and operating policies of x. "@en ;
                  cco:ont00001754 "http://www.austlii.edu.au/legis/cth/consol_act/ca2001172/s50aa.html)" ;
                  cco:ont00001760 "https://www.commoncoreontologies.org/AgentOntology"^^xsd:anyURI .