diff --git a/src/cco-extensions/ModalRelationOntology.ttl b/src/cco-extensions/ModalRelationOntology.ttl
index 84b8f0e..9d0fd88 100644
--- a/src/cco-extensions/ModalRelationOntology.ttl
+++ b/src/cco-extensions/ModalRelationOntology.ttl
@@ -1810,12 +1810,14 @@ mro:ont00001883 rdf:type owl:ObjectProperty ;
 ###  https://www.commoncoreontologies.org/mro/ont00001884
 mro:ont00001884 rdf:type owl:ObjectProperty ;
                 rdfs:subPropertyOf mro:ont00001801 ;
+                rdfs:domain obo:BFO_0000001 ;
+                rdfs:range cco:ont00000127 ;
                 owl:inverseOf mro:ont00001980 ;
                 owl:propertyChainAxiom ( mro:ont00001917
                                          mro:BFO_0000176
                                        ) ;
                 rdfs:label "condition described by"@en ;
-                <http://www.w3.org/2004/02/skos/core#definition> "c condition_described_by p 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 ;
+                <http://www.w3.org/2004/02/skos/core#definition> "x condition_described_by y iff y is an instance of Performance Specification and x is an instance of Entity and y describes_condition x."@en ;
                 cco:ont00001760 <https://www.commoncoreontologies.org/ModalRelationOntology> .