diff --git a/packages/frontend/lib/rollup-plugin-create-search-index.ts b/packages/frontend/lib/rollup-plugin-create-search-index.ts
index 92559611eb..9b3ef223b8 100644
--- a/packages/frontend/lib/rollup-plugin-create-search-index.ts
+++ b/packages/frontend/lib/rollup-plugin-create-search-index.ts
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
 import { parse as vueSfcParse } from '@vue/compiler-sfc';
 import type { Plugin } from 'rollup';
 import fs from 'node:fs';
@@ -43,7 +48,11 @@ function outputAnalysisResultAsTS(outputPath: string, analysisResults: AnalysisR
 
 
   const tsOutput = `
-// To English
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
 // This file was automatically generated by create-search-index.
 // Do not edit this file.
 
diff --git a/packages/frontend/src/autogen/search-index.ts b/packages/frontend/src/autogen/search-index.ts
index aa7967dcf1..b0cf61dc9a 100644
--- a/packages/frontend/src/autogen/search-index.ts
+++ b/packages/frontend/src/autogen/search-index.ts
@@ -1,6 +1,11 @@
 
-// vue-props-analyzer によって自動生成されたファイルです。
-// 編集はしないでください。
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+// This file was automatically generated by create-search-index.
+// Do not edit this file.
 
 import { i18n } from '@/i18n'; //  i18n のインポート