diff --git a/src/cco-modules/InformationEntityOntology.ttl b/src/cco-modules/InformationEntityOntology.ttl
index 52b9ae9..65d6e93 100644
--- a/src/cco-modules/InformationEntityOntology.ttl
+++ b/src/cco-modules/InformationEntityOntology.ttl
@@ -414,8 +414,9 @@ cco:ont00001982 rdf:type owl:ObjectProperty ;
 cco:ont00001983 rdf:type owl:ObjectProperty ;
                  rdfs:subPropertyOf cco:ont00001966 ;
                  rdfs:domain cco:ont00001022 ;
+                 rdfs:range obo:BFO_0000001 ;
                  rdfs:label "is a ratio measurement of"@en ;
-                 skos:definition "x is_a_ratio_measurement_of y iff x is an instance of Information Content Entity and y is an instance of Entity and x describes some attribute of y relative to a scale having equal unit values and a zero value that corresponds to the absence of the attribute being measured."@en ;
+                 skos:definition "x is_a_ratio_measurement_of y iff x is an instance of Ratio Measurement Information Content Entity and y is an instance of Entity and x describes some attribute of y relative to a scale having equal unit values and a zero value that corresponds to the absence of the attribute being measured."@en ;
                  cco:ont00001760 "https://www.commoncoreontologies.org/InformationEntityOntology"^^xsd:anyURI .