diff --git a/packages/backend/migration/1711478468155-birthday-index.js b/packages/backend/migration/1711478468155-birthday-index.js
index 7954e3cd2b..806fc3d298 100644
--- a/packages/backend/migration/1711478468155-birthday-index.js
+++ b/packages/backend/migration/1711478468155-birthday-index.js
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
 export class BirthdayIndex1711478468155 {
     name = 'BirthdayIndex1711478468155'
 
diff --git a/packages/backend/src/server/api/endpoints/users/get-following-birthday-users.ts b/packages/backend/src/server/api/endpoints/users/get-following-birthday-users.ts
index 9377583df0..58a50d3b59 100644
--- a/packages/backend/src/server/api/endpoints/users/get-following-birthday-users.ts
+++ b/packages/backend/src/server/api/endpoints/users/get-following-birthday-users.ts
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
 import { Inject, Injectable } from '@nestjs/common';
 import { Brackets } from 'typeorm';
 import { DI } from '@/di-symbols.js';