diff --git a/src/cco-extensions/ModalRelationOntology.ttl b/src/cco-extensions/ModalRelationOntology.ttl
index 6b381bb..61b9eac 100644
--- a/src/cco-extensions/ModalRelationOntology.ttl
+++ b/src/cco-extensions/ModalRelationOntology.ttl
@@ -594,7 +594,7 @@ mro:BFO_0000200 rdf:type owl:ObjectProperty ;
                 rdfs:range obo:BFO_0000011 ;
                 <http://purl.org/dc/elements/1.1/identifier> "082-BFO" ;
                 rdfs:label "occupies spatiotemporal region"@en ;
-                <http://www.w3.org/2004/02/skos/core#definition> "(Elucidation) occupies spatiotemporal region is a relation between a process or process boundary p and the spatiotemporal region s which is its spatiotemporal extent"@en ;
+                <http://www.w3.org/2004/02/skos/core#definition> "x occupies_spatiotemporal_region y iff x is an instance of Process or Process Boundary and y is an instance of Spatiotemporal Region and y is the spatiotemporal extent of x."@en ;
                 <http://www.w3.org/2004/02/skos/core#example> "A particle emitted by a nuclear reactor occupies the spatiotemporal region which is its trajectory"@en .