diff --git a/ontology/observable/observable.ttl b/ontology/observable/observable.ttl
index 50eba0bb..cfc5cdd1 100644
--- a/ontology/observable/observable.ttl
+++ b/ontology/observable/observable.ttl
@@ -2849,6 +2849,12 @@ observable:FileFacet
 	rdfs:label "FileFacet"@en ;
 	rdfs:comment "A file facet is a grouping of characteristics unique to the storage of a file (computer resource for recording data discretely in a computer storage device) on a file system (process that manages how and where data on a storage device is stored, accessed and managed). [based on https://en.wikipedia.org/Computer_file and https://www.techopedia.com/definition/5510/file-system]"@en ;
 	sh:property
+		[
+			sh:datatype xsd:boolean ;
+			sh:maxCount "1"^^xsd:integer ;
+			sh:nodeKind sh:Literal ;
+			sh:path observable:isAllocated ;
+		] ,
 		[
 			sh:datatype xsd:boolean ;
 			sh:nodeKind sh:Literal ;
@@ -10228,6 +10234,13 @@ observable:isActive
 	rdfs:range xsd:boolean ;
 	.
 
+observable:isAllocated
+	a owl:DatatypeProperty ;
+	rdfs:label "isAllocated"@en ;
+	rdfs:comment "Indicates whether the object is (soft) allocated in the filesystem."@en ;
+	rdfs:range xsd:boolean ;
+	.
+
 observable:isDirectory
 	a owl:DatatypeProperty ;
 	rdfs:label "isDirectory"@en ;