diff --git a/.github/workflows/check-spdx-license-id.yml b/.github/workflows/check-spdx-license-id.yml
index 05582008b5..f9a8a01e0f 100644
--- a/.github/workflows/check-spdx-license-id.yml
+++ b/.github/workflows/check-spdx-license-id.yml
@@ -58,6 +58,7 @@ jobs:
             "packages/frontend/test"
             "packages/frontend-embed/@types"
             "packages/frontend-embed/src"
+            "packages/icons-subsetter/src"
             "packages/misskey-bubble-game/src"
             "packages/misskey-reversi/src"
             "packages/sw/src"
diff --git a/packages/icons-subsetter/src/generator.ts b/packages/icons-subsetter/src/generator.ts
index e87df01d1d..f37ec3bb75 100644
--- a/packages/icons-subsetter/src/generator.ts
+++ b/packages/icons-subsetter/src/generator.ts
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
 import { promises as fsp, existsSync } from 'fs';
 import path from 'path';
 import glob from 'tiny-glob';
diff --git a/packages/icons-subsetter/src/subsetter.ts b/packages/icons-subsetter/src/subsetter.ts
index d959fb81a5..9ef4d6a3e1 100644
--- a/packages/icons-subsetter/src/subsetter.ts
+++ b/packages/icons-subsetter/src/subsetter.ts
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
 import { promises as fsp } from 'fs';
 import { ttf2woff } from 'wasm-ttf2woff';