diff --git a/ontology/saref4ehaw.ttl b/ontology/saref4ehaw.ttl
index 3d0c7da9365d29cc6f62876a32bbeaa10883c787..a375e515876b2b86922a828d87bbb6fb76166e77 100644
--- a/ontology/saref4ehaw.ttl
+++ b/ontology/saref4ehaw.ttl
@@ -630,7 +630,7 @@ s4ehaw:hasResult rdf:type owl:DatatypeProperty ;
 
 ###  https://saref.etsi.org/saref4ehaw/hasValues
 s4ehaw:hasValues rdf:type owl:DatatypeProperty ;
-                 rdfs:comment "A relationship defining the set of values (an array) of a certain property, e.g., heart rate"@en ;
+                 rdfs:comment "A relationship defining the set of values (an ordered array of numbers) of a certain property, e.g., heart rate. Attention: to assure ordering in the serialization format, it is necessary to use either rdf:Seq (RDF/XML) or @list (JSON-LD). "@en ;
 		 rdfs:label "has values"@en .