diff --git a/src/cco-modules/TimeOntology.ttl b/src/cco-modules/TimeOntology.ttl
index 8e45ce3..60c8f01 100644
--- a/src/cco-modules/TimeOntology.ttl
+++ b/src/cco-modules/TimeOntology.ttl
@@ -80,10 +80,11 @@ cco:ont00001814 rdf:type owl:ObjectProperty ;
 ###  https://www.commoncoreontologies.org/ont00001821
 cco:ont00001821 rdf:type owl:ObjectProperty ;
                  rdfs:subPropertyOf cco:ont00001924 ;
+                 owl:inverseOf cco:ont00001814 ;
                  rdfs:domain obo:BFO_0000038 ;
                  rdfs:range obo:BFO_0000038 ;
                  rdfs:label "interval finished by"@en ;
-                 skos: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 ;
+                 skos: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/TimeOntology"^^xsd:anyURI .