diff --git a/packages/backend/src/core/activitypub/misc/searchableBy.ts b/packages/backend/src/core/activitypub/misc/searchableBy.ts
index c07c6004a7..090f7e3115 100644
--- a/packages/backend/src/core/activitypub/misc/searchableBy.ts
+++ b/packages/backend/src/core/activitypub/misc/searchableBy.ts
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project, yojo-art team
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
 export function parseSearchableByFromTags(tags: string[]): 'public' | 'followersAndReacted' | 'reactedOnly' | 'private' | null {
 	if (tags.includes('searchable_by_all_users')) return 'public';
 	if (tags.includes('searchable_by_followers_only')) return 'followersAndReacted';