diff --git a/ontology/saref4ehaw.ttl b/ontology/saref4ehaw.ttl
index 954c41d64d5ce5a9546b52b6d0c40aabeea933eb..c5f587447e9b5d94d59544bd8ff13fe121c1a9f8 100644
--- a/ontology/saref4ehaw.ttl
+++ b/ontology/saref4ehaw.ttl
@@ -150,11 +150,9 @@ s4ehaw:hasConstraints rdf:type owl:ObjectProperty ;
 
 ###  https://saref.etsi.org/s4ehaw/hasContact
 s4ehaw:hasContact rdf:type owl:ObjectProperty ;
-                  rdfs:domain s4ehaw:Ban ,
-                              s4ehaw:HealthDevice ;
+                  rdfs:domain s4ehaw:Ban ;
                   rdfs:range s4ehaw:Contact ;
-                  rdfs:comment "Defines the relatonship between a BAN that has one or multiple contacts (e.g. the patient or user that is monitored through this BAN, the caregiver that is using this BAN for monitoring purposes)" ,
-                               "Defines the relatonship between a health Device that has one or multiple contacts (e.g. the patient or user that is sensed by this device, the caregiver that is using the health device)" ;
+                  rdfs:comment "Defines the relatonship between a BAN that has one or multiple contacts (e.g. the patient or user that is monitored through this BAN, the caregiver that is using this BAN for monitoring purposes)" ;
                   rdfs:label "has contact"@en .
 
 
@@ -286,6 +284,14 @@ s4ehaw:isAssociatedWith rdf:type owl:ObjectProperty ;
                         rdfs:label "is associated with"@en .
 
 
+###  https://saref.etsi.org/s4ehaw/isAttachedTo
+s4ehaw:isAttachedTo rdf:type owl:ObjectProperty ;
+                  rdfs:domain s4ehaw:HealthDevice ;
+                  rdfs:range s4ehaw:Actor ;
+                  rdfs:comment "Defines the relatonship between a health Device that is attached to a eHealth system Actor such as a patient, a user and or a caregiver." ;
+                  rdfs:label "is attached to"@en .
+
+
 ###  https://saref.etsi.org/s4ehaw/isDescribedBy
 s4ehaw:isDescribedBy rdf:type owl:ObjectProperty ;
                      rdfs:domain saref:Service ;