diff --git a/app/controllers/subscriptions_controller.rb b/app/controllers/subscriptions_controller.rb
index 388e72a6..87049981 100644
--- a/app/controllers/subscriptions_controller.rb
+++ b/app/controllers/subscriptions_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SubscriptionsController < ApplicationController
   include TurboStreamable