diff --git a/src/cco-extensions/ModalRelationOntology.ttl b/src/cco-extensions/ModalRelationOntology.ttl
index 81d352c..adf8b3c 100644
--- a/src/cco-extensions/ModalRelationOntology.ttl
+++ b/src/cco-extensions/ModalRelationOntology.ttl
@@ -622,7 +622,7 @@ mro:BFO_0000216 rdf:type owl:ObjectProperty ;
                 rdfs:range obo:BFO_0000006 ;
                 <http://purl.org/dc/elements/1.1/identifier> "246-BFO" ;
                 rdfs:label "spatially projects onto"@en ;
-                <http://www.w3.org/2004/02/skos/core#definition> "(Elucidation) spatially projects onto is a relation between some spatiotemporal region b and spatial region c such that at some time t, c is the spatial extent of b at t"@en ;
+                <http://www.w3.org/2004/02/skos/core#definition> "x spatially_projects_onto y iff x is an instance of Spatiotemporal Region and y is an instance of Spatial Region and y is the spatial extent of x."@en ;
                 <http://www.w3.org/2004/02/skos/core#scopeNote> "Users that require more sophisticated representations of time are encouraged to import a temporal extension of BFO-Core provided by the BFO development team. See documentation for guidance: <https://github.com/BFO-ontology/BFO-2020/tree/master/src/owl/profiles/temporal%20extensions>"@en .