diff --git a/files/meson.build b/files/meson.build
index 8f9c233..fcb1da9 100644
--- a/files/meson.build
+++ b/files/meson.build
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+# SPDX-FileCopyrightText: 2024 Yegor Yefremov <yegorslists@googlemail.com>
+
 if enable_libconfig
     install_data(
         sources: 'socketcand.conf',
diff --git a/meson.build b/meson.build
index 35f6b57..26afa20 100644
--- a/meson.build
+++ b/meson.build
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+# SPDX-FileCopyrightText: 2024 Matthias Weißer <m.weisser.m@gmail.com>
+
 project('socketcand', 'c', version : '0.6.1')
 conf = configuration_data()
 
diff --git a/meson_options.txt b/meson_options.txt
index 1958038..4c4244a 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+# SPDX-FileCopyrightText: 2024 Matthias Weißer <m.weisser.m@gmail.com>
+
 option('libconfig', type: 'boolean', value: false, description: 'enable support for libconfig')
 option('libsocketcan', type: 'boolean', value: false, description: 'enable support for libsocketcan')
 option('rc_script', type: 'boolean', value: false, description: 'enable creation of rc.d start script')
diff --git a/src/meson.build b/src/meson.build
index a18538a..d4a0d09 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+# SPDX-FileCopyrightText: 2024 Matthias Weißer <m.weisser.m@gmail.com>
+
 src =  [
     'socketcand.c',
     'statistics.c',