diff --git a/MasterDataModels/Documents/DocumentModelMetadataDescription.md b/MasterDataModels/Documents/DocumentModelMetadataDescription.md
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+# Generic metadata definition
+
+![Generic metadata definition](Assets/OIHDataModelDocumentMetadataSpecification.svg)
diff --git a/MasterDataModels/Documents/README.md b/MasterDataModels/Documents/README.md
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@@ -107,8 +107,12 @@ This folder contains a draft of [operations](DocumentModelDescription.md) that c
 
 ## UML Diagram
 
+The extended model specification does contain all properties that are required in order to handle additional functionalities of DMS/ECM/EIM systems. Metadata definitions can be additionally queried. Therefore a [specification of generic metadata](DocumentModelMetadataDescription.md) describes how information can be passed.
+
 ![Master Data Model - Documents Extended Version](Assets/OIHDataModelDocuments.svg)
 
+The basic model specification describe a basic implementation for sharing documents and files without the need of handling metadata or additional information.
+
 ![Master Data Model - Documents Basic Version](Assets/OIHDataModelDocumentsBasic.svg)
 
 ## JSON Schema