diff --git a/packages/frontend/src/pages/reversi/game.emoji-balloon.vue b/packages/frontend/src/pages/reversi/game.emoji-balloon.vue
index fecb760430..6beebebd4c 100644
--- a/packages/frontend/src/pages/reversi/game.emoji-balloon.vue
+++ b/packages/frontend/src/pages/reversi/game.emoji-balloon.vue
@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: syuilo and other misskey contributors
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
 <template>
 <Transition
 	:enterActiveClass="$style.transition_balloon_enterActive"