diff --git a/src/cco-extensions/ModalRelationOntology.ttl b/src/cco-extensions/ModalRelationOntology.ttl
index 3a57c4b..6f90958 100644
--- a/src/cco-extensions/ModalRelationOntology.ttl
+++ b/src/cco-extensions/ModalRelationOntology.ttl
@@ -1756,6 +1756,8 @@ mro:ont00001877 rdf:type owl:ObjectProperty ;
 mro:ont00001878 rdf:type owl:ObjectProperty ;
                 rdfs:subPropertyOf mro:mro00000001 ;
                 owl:inverseOf mro:ont00001919 ;
+                rdfs:domain cco:ont00000253 ;
+                rdfs:range obo:BFO_0000001 ;
                 rdfs:label "is mention of"@en ;
                 <http://www.w3.org/2004/02/skos/core#definition> "x is_mention_of y iff x is an instance Information Bearing Entity and y is an instance Entity, such that x is used as a reference to y."@en ;
                 cco:ont00001760 <https://www.commoncoreontologies.org/ModalRelationOntology> .