diff --git a/steal_emoji_policy.ex b/steal_emoji_policy.ex
index a4681d5..df2fde6 100644
--- a/steal_emoji_policy.ex
+++ b/steal_emoji_policy.ex
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.ActivityPub.MRF.StealEmojiPolicy do
   require Logger
   @moduledoc "Detect new emoji and steal them"