diff --git a/ontology/saref4ehaw.ttl b/ontology/saref4ehaw.ttl
index fc47f12e767fb8a43c5144d6d342b90b7e90def4..4bc3fdc1c0f5a20efde79201489ef1a86bf6b804 100644
--- a/ontology/saref4ehaw.ttl
+++ b/ontology/saref4ehaw.ttl
@@ -467,6 +467,19 @@ rdf:comment rdf:type owl:AnnotationProperty .
                rdfs:range :Mode .
 
 
+###  https://saref.etsi.org/s4ehaw/isComposedOf
+
+:isComposedOf rdf:type owl:ObjectProperty ;
+          
+          rdfs:label "is composed of"@en ;
+          
+          rdfs:comment "Defines the fact that a eHealth device can be a composite health device that is composed of one or multiple sub-devices" ;
+          
+          rdfs:domain :HealthDevice ;
+          
+          rdfs:range :HealthDevice .
+
+
 
 ###  https://saref.etsi.org/s4ehaw/isAttachedTo