diff --git a/src/cco-imports/bfo-core.ttl b/src/cco-imports/bfo-core.ttl
index 8f2aae2..c5b5a49 100644
--- a/src/cco-imports/bfo-core.ttl
+++ b/src/cco-imports/bfo-core.ttl
@@ -275,7 +275,7 @@ skos:scopeNote rdf:type owl:AnnotationProperty .
                                              rdfs:range <http://purl.obolibrary.org/obo/BFO_0000008> ;
                                              dc11:identifier "118-BFO" ;
                                              rdfs:label "exists at"@en ;
-                                             skos:definition "(Elucidation) exists at is a relation between a particular and some temporal region at which the particular exists"@en ;
+                                             skos:definition "(Elucidation) exists at is a relation between an instance of Entity and some temporal region where the instance exists"@en ;
                                              skos:example "First World War exists at 1914-1916; Mexico exists at January 1, 2000"@en .