diff --git a/docs/quick-start.md b/docs/quick-start.md
index 21b8515e2..c9513c964 100644
--- a/docs/quick-start.md
+++ b/docs/quick-start.md
@@ -1,3 +1,9 @@
+<!--
+SPDX-FileCopyrightText: 2024 - 2025 Suguru Hirahara
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
 # Quick start
 
 <!--