diff --git a/apps/generate-kustomizations.sh b/apps/generate-kustomizations.sh
index 0d138e2..857f418 100755
--- a/apps/generate-kustomizations.sh
+++ b/apps/generate-kustomizations.sh
@@ -1,9 +1,14 @@
 #!/bin/sh -e
 # Generates kubernetes kustomizations
-find -mindepth 1 -maxdepth 1 -type d | while read dir;
-do  echo "$dir"
+if test $# -gt 0
+then dir=$1
 	{ echo 'apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:'
-	find $dir -type f -not -name "*.bak" -not -name "kustomization.yaml" -printf "  - %f\n"; } | tee $dir/kustomization.yaml
-done
+	find $dir -maxdepth 1 -type f -name "*.yaml" -not -name "kustomization.yaml" -printf "  - %f\n"; } | tee $dir/kustomization.yaml
+else
+	find -mindepth 1 -maxdepth 1 -type d | while read dir
+		do echo "$dir"
+			$0 "$dir"
+		done
+fi
diff --git a/apps/kustomization.yaml b/apps/kustomization.yaml
new file mode 100644
index 0000000..ebeee95
--- /dev/null
+++ b/apps/kustomization.yaml
@@ -0,0 +1,8 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - gitea-kustomization.yaml
+  - forgejo-kustomization.yaml
+  - invoiceninja-customization.yaml
+  - vikunja-kustomization.yaml
+  - vikunja-test-kustomization.yaml