diff --git a/api/v2beta2/helmrelease_types.go b/api/v2beta2/helmrelease_types.go
index 6651a841d..2c280849e 100644
--- a/api/v2beta2/helmrelease_types.go
+++ b/api/v2beta2/helmrelease_types.go
@@ -401,7 +401,7 @@ func (in HelmChartTemplate) GetNamespace(defaultNamespace string) string {
 // HelmChartTemplateVerification verifies the authenticity of an OCI Helm chart.
 type HelmChartTemplateVerification struct {
 	// Provider specifies the technology used to sign the OCI Helm chart.
-	// +kubebuilder:validation:Enum=cosign
+	// +kubebuilder:validation:Enum=cosign;notation
 	// +kubebuilder:default:=cosign
 	Provider string `json:"provider"`
 
diff --git a/config/crd/bases/helm.toolkit.fluxcd.io_helmreleases.yaml b/config/crd/bases/helm.toolkit.fluxcd.io_helmreleases.yaml
index c559d2b37..55ab127b9 100644
--- a/config/crd/bases/helm.toolkit.fluxcd.io_helmreleases.yaml
+++ b/config/crd/bases/helm.toolkit.fluxcd.io_helmreleases.yaml
@@ -1391,6 +1391,7 @@ spec:
                               sign the OCI Helm chart.
                             enum:
                             - cosign
+                            - notation
                             type: string
                           secretRef:
                             description: |-