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-rw-r--r--challenge.html4
1 files changed, 4 insertions, 0 deletions
diff --git a/challenge.html b/challenge.html
index ea18794..0747afb 100644
--- a/challenge.html
+++ b/challenge.html
@@ -1,3 +1,7 @@
+<!--
+ SPDX-License-Identifier: BSD-2-Clause
+ SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
+-->
<!DOCTYPE html>
<html lang="en">
<head>