diff --git a/plugin/builtin/namespacetransformer/NamespaceTransformer_test.go b/plugin/builtin/namespacetransformer/NamespaceTransformer_test.go
index 40096a3af4e..ce3043a0e11 100644
--- a/plugin/builtin/namespacetransformer/NamespaceTransformer_test.go
+++ b/plugin/builtin/namespacetransformer/NamespaceTransformer_test.go
@@ -99,6 +99,15 @@ metadata:
   name: crd
 `)
 
+	// Import note: The namespace transformer is in charge of
+	// the metadata.namespace field. The namespace transformer SHOULD
+	// NOT modify neither the "namespace" subfield within the
+	// ClusterRoleBinding.subjects field nor the "namespace"
+	// subfield in the ValidatingWebhookConfiguration.webhooks field.
+	// This is the role of the namereference Transformer to handle
+	// object reference changes (prefix/suffix and namespace).
+	// For use cases involving simultaneous change of name and namespace,
+	// refer to namespaces tests in pkg/target test suites.
 	th.AssertActualEqualsExpected(rm, `
 apiVersion: v1
 kind: ConfigMap