diff --git a/src/cco-extensions/ModalRelationOntology.ttl b/src/cco-extensions/ModalRelationOntology.ttl
index 7099e54..9319c07 100644
--- a/src/cco-extensions/ModalRelationOntology.ttl
+++ b/src/cco-extensions/ModalRelationOntology.ttl
@@ -1166,10 +1166,11 @@ mro:ont00001820 rdf:type owl:ObjectProperty ;
 ###  https://www.commoncoreontologies.org/mro/ont00001821
 mro:ont00001821 rdf:type owl:ObjectProperty ;
                 rdfs:subPropertyOf mro:ont00001924 ;
+                owl:inverseOf mro:ont00001814 ;
                 rdfs:domain obo:BFO_0000038 ;
                 rdfs:range obo:BFO_0000038 ;
                 rdfs:label "interval finished by"@en ;
-                <http://www.w3.org/2004/02/skos/core#definition> "A Temporal Interval INT2 is finished by some Temporal Interval INT1 iff there exists Temporal Instants inst1, inst2, and inst3 such that inst 1 is the starting instant of INT1, inst2 is the ending instant of both INT1 and INT2, inst3 is the starting instant of INT2, and inst3 is before inst1."@en ;
+                <http://www.w3.org/2004/02/skos/core#definition> "x interval_finished_by y iff x and y are both instances of One Dimensional Temporal Region and y interval_finishes x."@en ;
                 cco:ont00001754 "J. F. Allen and J. A. G. M. Koomen. Planning using a temporal world model. In Proceedings of the 8th International Joint Conference on Artificial Intelligence (IJCAI-1983)  pages 741–747. Available at: https://www.ijcai.org/Proceedings/83-2/Papers/036.pdf"@en ;
                 cco:ont00001760 <https://www.commoncoreontologies.org/ModalRelationOntology> .