[LICENSE] Copyright -> SPDX-FileCopyrightText:
diff --git a/verilog/dv/caravel/stub.c b/verilog/dv/caravel/stub.c
index c89330c..575cfc3 100644
--- a/verilog/dv/caravel/stub.c
+++ b/verilog/dv/caravel/stub.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2020 Efabless Corporation
+ * SPDX-FileCopyrightText: 2020 Efabless Corporation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.