diff --git a/taxonomies/Message.ttl b/taxonomies/Message.ttl
index 23b10f28..5a429603 100644
--- a/taxonomies/Message.ttl
+++ b/taxonomies/Message.ttl
@@ -219,19 +219,19 @@ ids:recipientScope a owl:ObjectProperty;
 ids:ContractRequestMessage a owl:Class ;
     rdfs:subClassOf ids:RequestMessage ;
     rdfs:label "Contract Request Message"@en;
-    rdfs:comment "Message containing a suggested content contract (as offered by the data consumer to the data provider) in the associated payload (which is an instance of ContractRequest)."@en ;
+    rdfs:comment "Message containing a suggested content contract (as offered by the data consumer to the data provider) in the associated payload (which is an instance of ids:ContractRequest)."@en ;
     .
 
 ids:ContractResponseMessage a owl:Class ;
     rdfs:subClassOf ids:ResponseMessage ;
     rdfs:label "Contract Response Message"@en;
-    rdfs:comment "Message containing a response to a contract request (of a data consumer) in form of a counter-proposal of a contract in the associated payload (which is an instance of ContractOffcer). "@en ;
+    rdfs:comment "Message containing a response to a contract request (of a data consumer) in form of a counter-proposal of a contract in the associated payload (which is an instance of ids:ContractOffer). "@en ;
     .
     
 ids:ContractOfferMessage a owl:Class ;
     rdfs:subClassOf ids:NotificationMessage ;
     rdfs:label "Contract Offer Message"@en;
-    rdfs:comment "Message containing a offered content contract (as offered by a data provider to the data consumer) in the associated payload (which is an instance of ContractOffer). In contrast to the ids:ContractResponseMessage, the ids:ContractOfferMessage is not related to a previous contract "@en.
+    rdfs:comment "Message containing a offered content contract (as offered by a data provider to the data consumer) in the associated payload (which is an instance of ids:ContractOffer). In contrast to the ids:ContractResponseMessage, the ids:ContractOfferMessage is not related to a previous contract "@en.
 
 
 ids:ContractAgreementMessage a owl:Class ;