diff --git a/api/v1alpha1/custom_package_types.go b/api/v1alpha1/custom_package_types.go
index ef421929..69d5ade5 100644
--- a/api/v1alpha1/custom_package_types.go
+++ b/api/v1alpha1/custom_package_types.go
@@ -56,7 +56,8 @@ type ArgoCDPackageSpec struct {
 	ApplicationFile string `json:"applicationFile"`
 	Name            string `json:"name"`
 	Namespace       string `json:"namespace"`
-	Type            string `json:"type"`
+	// +kubebuilder:validation:Enum:=Application;ApplicationSet
+	Type string `json:"type"`
 }
 
 type CustomPackageStatus struct {
diff --git a/pkg/controllers/resources/idpbuilder.cnoe.io_custompackages.yaml b/pkg/controllers/resources/idpbuilder.cnoe.io_custompackages.yaml
index 6ad4f86d..f22b5ec8 100644
--- a/pkg/controllers/resources/idpbuilder.cnoe.io_custompackages.yaml
+++ b/pkg/controllers/resources/idpbuilder.cnoe.io_custompackages.yaml
@@ -50,6 +50,9 @@ spec:
                   namespace:
                     type: string
                   type:
+                    enum:
+                    - Application
+                    - ApplicationSet
                     type: string
                 required:
                 - applicationFile