diff --git a/counters_option.py b/counters_option.py
index 8d660cf675c30769f6a1dddf49e80c2f25a4150a..f3f2df27d706c0fddc6dd097664de144a773066b 100755
--- a/counters_option.py
+++ b/counters_option.py
@@ -1,5 +1,8 @@
 #! /usr/bin/python3
 
+# SPDX-License-Identifier: GPL-3.0-or-later
+# Copyright (C) 2018-2021 Georges Da Costa <georges.da-costa@irit.fr>
+
 linux_include = '/usr/include/linux/perf_event.h'
 
 string = """#include <linux/perf_event.h>