diff --git a/ontology/uco/observable/observable.ttl b/ontology/uco/observable/observable.ttl
index a11ef758..6dc75195 100644
--- a/ontology/uco/observable/observable.ttl
+++ b/ontology/uco/observable/observable.ttl
@@ -2440,8 +2440,8 @@ observable:Disk
 	rdfs:seeAlso [
 		a sh:NodeShape ;
 		rdfs:comment "This anonymous shape is attached with rdfs:seeAlso in order to associate a warning-severity class constraint, that will only be necessary as an independent shape until UCO 2.0.0."@en ;
-		sh:class observable:Device ;
-		sh:message "In UCO 2.0.0, uco-observable:Disk will be a subclass of uco-observable:Device.  In preparation for UCO 2.0.0, the additional type uco-observable:Device should be assigned to this node."@en ;
+		sh:class observable:StorageMedium ;
+		sh:message "In UCO 2.0.0, uco-observable:Disk will be a subclass of uco-observable:StorageMedium.  In preparation for UCO 2.0.0, the additional type uco-observable:StorageMedium should be assigned to this node."@en ;
 		sh:severity sh:Warning ;
 		sh:targetClass observable:Disk ;
 	] ;