diff --git a/ontology/uco-gufo.ttl b/ontology/uco-gufo.ttl
index 57c77e6..af74787 100644
--- a/ontology/uco-gufo.ttl
+++ b/ontology/uco-gufo.ttl
@@ -218,6 +218,14 @@ uco-identity:Person
 		;
 	.
 
+uco-observable:AlternateDataStream
+	a gufo:Kind ;
+	rdfs:subClassOf
+		drafting:Endurant ,
+		gufo:Object
+		;
+	.
+
 uco-observable:BluetoothAddressFacet
 	a drafting:SpecificFacetType ;
 	.
@@ -229,6 +237,10 @@ uco-observable:Device
 		;
 	.
 
+uco-observable:FileSystemObject
+	a gufo:Category ;
+	.
+
 uco-observable:MACAddressFacet
 	a drafting:GeneralFacetType ;
 	.
diff --git a/tests/exemplars.ttl b/tests/exemplars.ttl
index a25b9a9..e32d28a 100644
--- a/tests/exemplars.ttl
+++ b/tests/exemplars.ttl
@@ -30,6 +30,15 @@ kb:Action-13c91d40-9ca0-4558-81a1-4f7db888c371
 	uco-action:startTime "2020-01-02T03:04:05Z"^^xsd:dateTime ;
 	.
 
+kb:AlternateDataStream-e6ceee40-5614-4740-b08c-d21ce9b2356d
+	a
+		uco-observable:AlternateDataStream ,
+		uco-observable:FileSystemObject
+		;
+	rdfs:comment "TODO - The assignment of FileSystemObject is only necessary until UCO Issue 590 is incorporated."@en ;
+	rdfs:seeAlso <https://github.com/ucoProject/UCO/issues/590> ;
+	.
+
 kb:AnalyticResult-34fb92db-d576-45a7-9d62-dae04510968f
 	a uco-analysis:AnalyticResult ;
 	.
diff --git a/tests/test_exemplar_coverage.py b/tests/test_exemplar_coverage.py
index a6ce568..7e0ff06 100644
--- a/tests/test_exemplar_coverage.py
+++ b/tests/test_exemplar_coverage.py
@@ -20,6 +20,7 @@
 from typing import Optional, Set
 
 from rdflib import RDF, RDFS, Graph, URIRef
+from rdflib.query import ResultRow
 
 NS_RDF = RDF
 NS_RDFS = RDFS
@@ -34,6 +35,7 @@ def test_exemplar_coverage() -> None:
     ontologies) designated a subclass of some C', and each property P
     designated a subproperty of some P', C (/P) is used in the exemplars
     graph.
+    For gUFO, instances of a gufo:Type are also included in the review.
     """
     exemplar_graph = Graph()
     profile_graph = Graph()
@@ -66,6 +68,22 @@ def test_exemplar_coverage() -> None:
         assert isinstance(triple[0], URIRef)
         classes_mapped.add(triple[0])
 
+    gufo_type_query = """\
+PREFIX gufo: <http://purl.org/nemo/gufo#>
+SELECT ?nClass
+WHERE {
+  # owl:Class restriction is to not pick up Relators.
+  ?nClass
+    a owl:Class ;
+    a/rdfs:subClassOf* gufo:Type ;
+    .
+}
+"""
+    for gufo_type_query_result in tbox_graph.query(gufo_type_query):
+        assert isinstance(gufo_type_query_result, ResultRow)
+        assert isinstance(gufo_type_query_result[0], URIRef)
+        classes_mapped.add(gufo_type_query_result[0])
+
     result: Optional[bool]
 
     class_query = """\