diff --git a/src/cco-extensions/ModalRelationOntology.ttl b/src/cco-extensions/ModalRelationOntology.ttl
index 5f57366..7819173 100644
--- a/src/cco-extensions/ModalRelationOntology.ttl
+++ b/src/cco-extensions/ModalRelationOntology.ttl
@@ -2727,6 +2727,8 @@ mro:ont00001980 rdf:type owl:ObjectProperty ;
                 owl:propertyChainAxiom ( mro:BFO_0000178
                                          mro:ont00001982
                                        ) ;
+                rdfs:domain cco:ont00000127 ;
+                rdfs:range obo:BFO_0000001 ;
                 rdfs:label "describes condition"@en ;
                 <http://www.w3.org/2004/02/skos/core#definition> "p describes_condition c iff p is an instance of a Performance Specification, and p has part d, and d is an instance of a Descriptive Information Content Entity, and p prescribes an entity s, and d describes c, and c is an entity that is causally relevant to s existing as prescribed by p."@en ;
                 cco:ont00001760 <https://www.commoncoreontologies.org/ModalRelationOntology> .