diff --git a/clients/cli/meson.build b/clients/cli/meson.build
index b1b242691..8dd05affc 100644
--- a/clients/cli/meson.build
+++ b/clients/cli/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 name = 'nmcli'
 
 # FIXME: nmcli-completion should be renamed to nmcli
diff --git a/clients/cloud-setup/meson.build b/clients/cloud-setup/meson.build
index b0a6191c4..d8f96539e 100644
--- a/clients/cloud-setup/meson.build
+++ b/clients/cloud-setup/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 name = 'nm-cloud-setup'
 
 if install_systemdunitdir
diff --git a/clients/common/meson.build b/clients/common/meson.build
index f68435ec9..c32bb5e7c 100644
--- a/clients/common/meson.build
+++ b/clients/common/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 common_inc = include_directories('.')
 
 common_deps = [
diff --git a/clients/common/tests/meson.build b/clients/common/tests/meson.build
index 479cb7810..43b1f7c94 100644
--- a/clients/common/tests/meson.build
+++ b/clients/common/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 common_c_flags = clients_c_flags + ['-DNETWORKMANAGER_COMPILATION_TEST']
 
 test_name = 'test-clients-common'
diff --git a/clients/meson.build b/clients/meson.build
index 8b2fa4421..5e6dd6a4c 100644
--- a/clients/meson.build
+++ b/clients/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 clients_c_flags = ['-DNETWORKMANAGER_COMPILATION=NM_NETWORKMANAGER_COMPILATION_CLIENT']
 
 name = 'nm-online'
diff --git a/clients/tui/meson.build b/clients/tui/meson.build
index db6bd429f..4f945a695 100644
--- a/clients/tui/meson.build
+++ b/clients/tui/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 name = 'nmtui'
 
 common_c_flags = clients_c_flags + ['-DG_LOG_DOMAIN="@0@"'.format(name)]
diff --git a/clients/tui/newt/meson.build b/clients/tui/newt/meson.build
index d543f7ea6..f2af7b207 100644
--- a/clients/tui/newt/meson.build
+++ b/clients/tui/newt/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 sources = files(
   'nmt-newt-button-box.c',
   'nmt-newt-button.c',
diff --git a/data/meson.build b/data/meson.build
index b572d27da..de08c91c6 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 configure_file(
   input: 'server.conf.in',
   output: '@BASENAME@',
diff --git a/dispatcher/meson.build b/dispatcher/meson.build
index 7feb9597f..d0637e9c5 100644
--- a/dispatcher/meson.build
+++ b/dispatcher/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 dispatcher_inc = include_directories('.')
 
 name = 'nm-dispatcher'
diff --git a/dispatcher/tests/meson.build b/dispatcher/tests/meson.build
index 83c915e58..5c6f6b12a 100644
--- a/dispatcher/tests/meson.build
+++ b/dispatcher/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_unit = 'test-dispatcher-envp'
 
 deps = [
diff --git a/docs/api/meson.build b/docs/api/meson.build
index 30f82188f..d4da41b0b 100644
--- a/docs/api/meson.build
+++ b/docs/api/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 if enable_introspection
   settings = 'settings-spec'
   output = settings + '.xml'
diff --git a/docs/libnm/meson.build b/docs/libnm/meson.build
index 1a73b4dd5..66cd31e89 100644
--- a/docs/libnm/meson.build
+++ b/docs/libnm/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 src_dirs = [
   libnm_core_inc,
   libnm_inc,
diff --git a/docs/meson.build b/docs/meson.build
index 53fcc9608..d1115c5ff 100644
--- a/docs/meson.build
+++ b/docs/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 subdir('libnm')
 subdir('api')
 
diff --git a/examples/C/glib/meson.build b/examples/C/glib/meson.build
index 7471ecad2..8eac711ca 100644
--- a/examples/C/glib/meson.build
+++ b/examples/C/glib/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 examples = [
   ['add-connection-gdbus', [libnm_enum_sources[1]], [uuid_dep]],
   ['add-connection-libnm', [], [libnm_dep]],
diff --git a/examples/C/qt/meson.build b/examples/C/qt/meson.build
index 172502a21..87f60f5f3 100644
--- a/examples/C/qt/meson.build
+++ b/examples/C/qt/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 examples = [
   ['add-connection-wired', []],
   ['list-connections', []],
diff --git a/introspection/meson.build b/introspection/meson.build
index f25251fd7..dc7841799 100644
--- a/introspection/meson.build
+++ b/introspection/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 ifaces_secret_agent_xml = files('org.freedesktop.NetworkManager.SecretAgent.xml')
 
 ifaces_vpn_plugin_xml = files('org.freedesktop.NetworkManager.VPN.Plugin.xml')
diff --git a/libnm-core/meson.build b/libnm-core/meson.build
index 42340f645..955e17766 100644
--- a/libnm-core/meson.build
+++ b/libnm-core/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 libnm_core_inc = include_directories('.')
 
 libnm_core_nm_default_dep = declare_dependency(
diff --git a/libnm-core/tests/meson.build b/libnm-core/tests/meson.build
index 148841155..58615e4df 100644
--- a/libnm-core/tests/meson.build
+++ b/libnm-core/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 # test-cert.p12 created with:
 #
 # openssl pkcs12 -export \
diff --git a/libnm/meson.build b/libnm/meson.build
index 29a21db76..325b18fb5 100644
--- a/libnm/meson.build
+++ b/libnm/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 libnm_inc = include_directories('.')
 
 libnm_nm_default_dep = declare_dependency(
diff --git a/libnm/tests/meson.build b/libnm/tests/meson.build
index 76c3b2876..59fb771dd 100644
--- a/libnm/tests/meson.build
+++ b/libnm/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_units = [
   ['test-libnm', 30],
   ['test-nm-client', 90],
diff --git a/man/meson.build b/man/meson.build
index f9130535c..407d027e9 100644
--- a/man/meson.build
+++ b/man/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 common_ent_file = configure_file(
   input: 'common.ent.in',
   output: '@BASENAME@',
diff --git a/meson.build b/meson.build
index 0d8a15bd5..60fa5734f 100644
--- a/meson.build
+++ b/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 project(
   'NetworkManager', 'c',
 # NOTE: When incrementing version also:
diff --git a/po/meson.build b/po/meson.build
index a1e071ecd..3565653ef 100644
--- a/po/meson.build
+++ b/po/meson.build
@@ -1 +1,3 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 i18n.gettext(nm_name, preset: 'glib')
diff --git a/shared/c-list/meson.build b/shared/c-list/meson.build
index 66504a29e..57f6b8ff3 100644
--- a/shared/c-list/meson.build
+++ b/shared/c-list/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 project(
         'c-list',
         'c',
diff --git a/shared/c-list/src/meson.build b/shared/c-list/src/meson.build
index 0261ae0c2..52d6d2aa6 100644
--- a/shared/c-list/src/meson.build
+++ b/shared/c-list/src/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 #
 # target: libclist.so
 # (No .so is built so far, since we are header-only. This might change in the
diff --git a/shared/c-rbtree/meson.build b/shared/c-rbtree/meson.build
index c13194676..d0277c989 100644
--- a/shared/c-rbtree/meson.build
+++ b/shared/c-rbtree/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 project(
         'c-rbtree',
         'c',
diff --git a/shared/c-rbtree/src/meson.build b/shared/c-rbtree/src/meson.build
index d0b4d63ce..a16e899f4 100644
--- a/shared/c-rbtree/src/meson.build
+++ b/shared/c-rbtree/src/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 #
 # target: libcrbtree.so
 #
diff --git a/shared/c-siphash/meson.build b/shared/c-siphash/meson.build
index 2b07b019b..b90cde2a8 100644
--- a/shared/c-siphash/meson.build
+++ b/shared/c-siphash/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 project(
         'c-siphash',
         'c',
diff --git a/shared/c-siphash/src/meson.build b/shared/c-siphash/src/meson.build
index 7ee9c601e..606b3763e 100644
--- a/shared/c-siphash/src/meson.build
+++ b/shared/c-siphash/src/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 #
 # target: libcsiphash.so
 #
diff --git a/shared/c-stdaux/meson.build b/shared/c-stdaux/meson.build
index c8c5da536..6843e284d 100644
--- a/shared/c-stdaux/meson.build
+++ b/shared/c-stdaux/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 project(
         'c-stdaux',
         'c',
diff --git a/shared/c-stdaux/src/meson.build b/shared/c-stdaux/src/meson.build
index f6db824d2..7b2e78560 100644
--- a/shared/c-stdaux/src/meson.build
+++ b/shared/c-stdaux/src/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 #
 # target: libcstdaux.so
 # (No .so is built so far, since we are header-only. This might change in the
diff --git a/shared/meson.build b/shared/meson.build
index 7bb5bca7a..2d26c6557 100644
--- a/shared/meson.build
+++ b/shared/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 shared_inc = include_directories('.')
 
 nm_default_dep = declare_dependency(include_directories: [top_inc, shared_inc])
diff --git a/shared/n-acd/meson.build b/shared/n-acd/meson.build
index 017dec566..25f778ad7 100644
--- a/shared/n-acd/meson.build
+++ b/shared/n-acd/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 project(
         'n-acd',
         'c',
diff --git a/shared/n-acd/src/meson.build b/shared/n-acd/src/meson.build
index 3e92681f9..4dbcc9af1 100644
--- a/shared/n-acd/src/meson.build
+++ b/shared/n-acd/src/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 #
 # target: libnacd.so
 #
diff --git a/shared/n-dhcp4/meson.build b/shared/n-dhcp4/meson.build
index 1dddfe4f0..9a1fcc4b1 100644
--- a/shared/n-dhcp4/meson.build
+++ b/shared/n-dhcp4/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 project(
         'n-dhcp4',
         'c',
diff --git a/shared/n-dhcp4/src/meson.build b/shared/n-dhcp4/src/meson.build
index 2ac8ac1cb..bed23ab9b 100644
--- a/shared/n-dhcp4/src/meson.build
+++ b/shared/n-dhcp4/src/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 #
 # target: libndhcp4.so
 #
diff --git a/shared/nm-glib-aux/tests/meson.build b/shared/nm-glib-aux/tests/meson.build
index 37c5c1b44..f6328db91 100644
--- a/shared/nm-glib-aux/tests/meson.build
+++ b/shared/nm-glib-aux/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_unit = 'test-shared-general'
 
 c_flags = [
diff --git a/src/devices/adsl/meson.build b/src/devices/adsl/meson.build
index a5d1c4b47..79834d7fa 100644
--- a/src/devices/adsl/meson.build
+++ b/src/devices/adsl/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 sources = files(
   'nm-atm-manager.c',
   'nm-device-adsl.c',
diff --git a/src/devices/bluetooth/meson.build b/src/devices/bluetooth/meson.build
index f0507c232..638a01a2f 100644
--- a/src/devices/bluetooth/meson.build
+++ b/src/devices/bluetooth/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 sources = files(
   'nm-bluez-manager.c',
   'nm-bt-error.c',
diff --git a/src/devices/meson.build b/src/devices/meson.build
index 2d874659c..40a5c9dcc 100644
--- a/src/devices/meson.build
+++ b/src/devices/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 subdir('adsl')
 
 if enable_modem_manager
diff --git a/src/devices/ovs/meson.build b/src/devices/ovs/meson.build
index 27e1b4d02..8457e68ae 100644
--- a/src/devices/ovs/meson.build
+++ b/src/devices/ovs/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 sources = files(
   'nm-device-ovs-bridge.c',
   'nm-device-ovs-interface.c',
diff --git a/src/devices/team/meson.build b/src/devices/team/meson.build
index 0e63183b5..c2b77cb91 100644
--- a/src/devices/team/meson.build
+++ b/src/devices/team/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 sources = files(
   'nm-device-team.c',
   'nm-team-factory.c',
diff --git a/src/devices/tests/meson.build b/src/devices/tests/meson.build
index bb53d1ee4..1ddd4f855 100644
--- a/src/devices/tests/meson.build
+++ b/src/devices/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_units = [
   'test-acd',
   'test-lldp',
diff --git a/src/devices/wifi/meson.build b/src/devices/wifi/meson.build
index 9f18a36b1..00404c71f 100644
--- a/src/devices/wifi/meson.build
+++ b/src/devices/wifi/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 iwd_sources = files()
 if enable_iwd
   iwd_sources += files(
diff --git a/src/devices/wwan/meson.build b/src/devices/wwan/meson.build
index ed6f80105..97252edc0 100644
--- a/src/devices/wwan/meson.build
+++ b/src/devices/wwan/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 nm_service_providers_source = files('nm-service-providers.c')
 
 sources = nm_service_providers_source + files(
diff --git a/src/dhcp/meson.build b/src/dhcp/meson.build
index 609fe663a..67f055d9f 100644
--- a/src/dhcp/meson.build
+++ b/src/dhcp/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 name = 'nm-dhcp-helper'
 
 c_flags = [
diff --git a/src/dhcp/tests/meson.build b/src/dhcp/tests/meson.build
index 031e2efdb..59a647ccb 100644
--- a/src/dhcp/tests/meson.build
+++ b/src/dhcp/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_units = [
   'test-dhcp-dhclient',
   'test-dhcp-utils',
diff --git a/src/dnsmasq/tests/meson.build b/src/dnsmasq/tests/meson.build
index 6e4298997..4584086ef 100644
--- a/src/dnsmasq/tests/meson.build
+++ b/src/dnsmasq/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_unit = 'test-dnsmasq-utils'
 
 exe = executable(
diff --git a/src/initrd/meson.build b/src/initrd/meson.build
index 09036f27c..c056f3c22 100644
--- a/src/initrd/meson.build
+++ b/src/initrd/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 sources = files(
   'nmi-cmdline-reader.c',
   'nmi-dt-reader.c',
diff --git a/src/initrd/tests/meson.build b/src/initrd/tests/meson.build
index 5dd2873cc..1d0908b9b 100644
--- a/src/initrd/tests/meson.build
+++ b/src/initrd/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 c_flags = test_c_flags + ['-DTEST_INITRD_DIR="@0@"'.format(meson.current_source_dir())]
 
 test_units = [
diff --git a/src/meson.build b/src/meson.build
index bc816a854..3f70a1d6c 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 src_inc = include_directories('.')
 
 daemon_nm_default_dep = declare_dependency(
diff --git a/src/ndisc/tests/meson.build b/src/ndisc/tests/meson.build
index c81e24ad4..349eebbac 100644
--- a/src/ndisc/tests/meson.build
+++ b/src/ndisc/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_unit = 'test-ndisc-fake'
 
 exe = executable(
diff --git a/src/platform/tests/meson.build b/src/platform/tests/meson.build
index 6f7173b6d..4a50bca97 100644
--- a/src/platform/tests/meson.build
+++ b/src/platform/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_fake_c_flags = test_c_flags + ['-DSETUP=nm_fake_platform_setup']
 test_linux_c_flags = test_c_flags + ['-DSETUP=nm_linux_platform_setup']
 
diff --git a/src/ppp/meson.build b/src/ppp/meson.build
index 0c458768f..181a6bef0 100644
--- a/src/ppp/meson.build
+++ b/src/ppp/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 name = 'nm-pppd-plugin'
 
 c_flags = [
diff --git a/src/settings/plugins/ifcfg-rh/meson.build b/src/settings/plugins/ifcfg-rh/meson.build
index d9dd3edba..e193ff96a 100644
--- a/src/settings/plugins/ifcfg-rh/meson.build
+++ b/src/settings/plugins/ifcfg-rh/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 install_data(
   'nm-ifcfg-rh.conf',
   install_dir: dbus_conf_dir,
diff --git a/src/settings/plugins/ifcfg-rh/tests/meson.build b/src/settings/plugins/ifcfg-rh/tests/meson.build
index 216990457..1ce61c90a 100644
--- a/src/settings/plugins/ifcfg-rh/tests/meson.build
+++ b/src/settings/plugins/ifcfg-rh/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_unit = 'test-ifcfg-rh'
 
 exe = executable(
diff --git a/src/settings/plugins/ifupdown/meson.build b/src/settings/plugins/ifupdown/meson.build
index 0cabe771f..7e2b44fbb 100644
--- a/src/settings/plugins/ifupdown/meson.build
+++ b/src/settings/plugins/ifupdown/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 sources = files(
   'nms-ifupdown-interface-parser.c',
   'nms-ifupdown-parser.c',
diff --git a/src/settings/plugins/ifupdown/tests/meson.build b/src/settings/plugins/ifupdown/tests/meson.build
index 1ca094b52..a39e4e21e 100644
--- a/src/settings/plugins/ifupdown/tests/meson.build
+++ b/src/settings/plugins/ifupdown/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_unit = 'test-ifupdown'
 
 exe = executable(
diff --git a/src/settings/plugins/keyfile/tests/meson.build b/src/settings/plugins/keyfile/tests/meson.build
index 7bf9fda00..cd1dc3aa5 100644
--- a/src/settings/plugins/keyfile/tests/meson.build
+++ b/src/settings/plugins/keyfile/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_unit = 'test-keyfile-settings'
 
 exe = executable(
diff --git a/src/settings/plugins/meson.build b/src/settings/plugins/meson.build
index 83981aaba..cde0844be 100644
--- a/src/settings/plugins/meson.build
+++ b/src/settings/plugins/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 if enable_ifcfg_rh
   subdir('ifcfg-rh')
 endif
diff --git a/src/supplicant/tests/meson.build b/src/supplicant/tests/meson.build
index 207d22f87..63012d106 100644
--- a/src/supplicant/tests/meson.build
+++ b/src/supplicant/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_unit = 'test-supplicant-config'
 
 exe = executable(
diff --git a/src/systemd/meson.build b/src/systemd/meson.build
index 5c4fa3e2a..9b87d772e 100644
--- a/src/systemd/meson.build
+++ b/src/systemd/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 sources = files(
   'src/libsystemd-network/arp-util.c',
   'src/libsystemd-network/dhcp-identifier.c',
diff --git a/src/tests/config/meson.build b/src/tests/config/meson.build
index e3ebfa199..cfe9c6153 100644
--- a/src/tests/config/meson.build
+++ b/src/tests/config/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 test_config_dir = meson.current_source_dir()
 
 test_unit = 'test-config'
diff --git a/src/tests/meson.build b/src/tests/meson.build
index ac877e184..df8d1cf80 100644
--- a/src/tests/meson.build
+++ b/src/tests/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 subdir('config')
 
 test_units = [
diff --git a/vapi/meson.build b/vapi/meson.build
index bc0984f22..1fe5ece5f 100644
--- a/vapi/meson.build
+++ b/vapi/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
 gnome.generate_vapi(
   libnm_name,
   sources: libnm_gir[0],