diff --git a/demo/complex-example.ttl b/demo/complex-example.ttl
index 99812dd..0a8fe40 100644
--- a/demo/complex-example.ttl
+++ b/demo/complex-example.ttl
@@ -14,7 +14,7 @@
 @prefix example: <http://example.org/> .
 
 example:ArchitectureModelDataset
-  a               sh:NodeShape ;
+  a               sh:NodeShape, rdfs:Class ;
   sh:node         example:Dataset ;
 
   sh:property   [ sh:description  "Location of the building" ;
@@ -62,7 +62,7 @@ example:ArchitectureModelDataset
                 ] .
 
 example:Dataset
-  a               sh:NodeShape ;
+  a               sh:NodeShape, rdfs:Class ;
   sh:property   [ sh:datatype     rdf:langString ;
                   sh:languageIn   ( "en" "de" ) ;
                   sh:uniqueLang   true ;
diff --git a/demo/datatypes.ttl b/demo/datatypes.ttl
index 543c452..516272f 100644
--- a/demo/datatypes.ttl
+++ b/demo/datatypes.ttl
@@ -1,10 +1,11 @@
 @prefix sh:      <http://www.w3.org/ns/shacl#> .
 @prefix dash:    <http://datashapes.org/dash#> .
 @prefix rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs:    <http://www.w3.org/2000/01/rdf-schema#> .
 @prefix xsd:     <http://www.w3.org/2001/XMLSchema#> .
 @prefix ex:      <http://example.org/> .
 
-ex:Demo a sh:NodeShape ;
+ex:Demo a sh:NodeShape, rdfs:Class ;
   sh:property [
     sh:datatype     xsd:string ;
     sh:maxCount     1 ;