1 files changed, 3 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 55b8578..fc75d46 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: BSD-2-Clause
+# SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
+
 powxy: *.go version.go wasm/solver.wasm
 	go build -o powxy