diff --git a/Makefile b/Makefile
index 15fa466..e50c231 100644
--- a/Makefile
+++ b/Makefile
@@ -46,7 +46,8 @@ all: \
   .git_submodule_init.done.log \
   dependencies/UCO/dependencies/CASE-Utility-SHACL-Inheritance-Reviewer/case_shacl_inheritance_reviewer/__init__.py \
   dependencies/UCO/dependencies/CASE-Utility-SHACL-Inheritance-Reviewer/setup.cfg \
-  dependencies/UCO/requirements.txt
+  dependencies/UCO/requirements.txt \
+  requirements.txt
 	rm -rf venv
 	$(PYTHON3) -m venv \
 	  venv
@@ -62,6 +63,9 @@ all: \
 	source venv/bin/activate \
 	  && pip install \
 	    --requirement dependencies/UCO/requirements.txt
+	source venv/bin/activate \
+	  && pip install \
+	    --requirement requirements.txt
 	touch $@
 
 check: \
diff --git a/ontology/investigation/investigation.ttl b/ontology/investigation/investigation.ttl
index fa1b970..76a2f84 100644
--- a/ontology/investigation/investigation.ttl
+++ b/ontology/investigation/investigation.ttl
@@ -178,14 +178,34 @@ investigation:InvestigativeAction
 		owl:Class ,
 		sh:NodeShape
 		;
-	rdfs:subClassOf uco-action:Action ;
+	rdfs:subClassOf
+		uco-action:Action ,
+		[
+			a owl:Restriction ;
+			owl:onProperty uco-action:result ;
+			owl:onClass investigation:ProvenanceRecord ;
+			owl:minQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
+		]
+		;
 	rdfs:label "InvestigativeAction"@en ;
 	rdfs:comment "An investigative action is something that may be done or performed within the context of an investigation, typically to examine or analyze evidence or other data."@en ;
-	sh:property [
-		sh:class investigation:InvestigativeAction ;
-		sh:nodeKind sh:BlankNodeOrIRI ;
-		sh:path investigation:wasInformedBy ;
-	] ;
+	sh:property
+		[
+			sh:class investigation:InvestigativeAction ;
+			sh:nodeKind sh:BlankNodeOrIRI ;
+			sh:path investigation:wasInformedBy ;
+		] ,
+		[
+			sh:message "An InvestigativeAction should have a ProvenanceRecord among its results.  This will be a requirement in CASE 2.0.0."@en ;
+			sh:path uco-action:result ;
+			sh:qualifiedMinCount "1"^^xsd:integer ;
+			sh:qualifiedValueShape [
+				a sh:NodeShape ;
+				sh:class investigation:ProvenanceRecord ;
+			] ;
+			sh:severity sh:Warning ;
+		]
+		;
 	sh:targetClass investigation:InvestigativeAction ;
 	.
 
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..d33bca9
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+pyshacl >= 0.24.0