diff --git a/src/cco-modules/InformationEntityOntology.ttl b/src/cco-modules/InformationEntityOntology.ttl
index 15e3816..de852d8 100644
--- a/src/cco-modules/InformationEntityOntology.ttl
+++ b/src/cco-modules/InformationEntityOntology.ttl
@@ -59,7 +59,7 @@ cco:ont00001808 rdf:type owl:ObjectProperty ;
                  rdfs:domain cco:ont00000958 ;
                  rdfs:range obo:BFO_0000001 ;
                  rdfs:label "is about"@en ;
-                 skos:definition "A primitive relationship between some instance of Entity x and an instance of Information Content Entity y."@en ;
+                 skos:definition "x is_about y iff x is an instance of Information Content Entity and y is an instance of Entity such that the information content of x depends on the existence of y. A primitive relationship."@en ;
                  cco:ont00001754 "http://purl.obolibrary.org/obo/IAO_0000136" ;
                  cco:ont00001760 "https://www.commoncoreontologies.org/InformationEntityOntology"^^xsd:anyURI .