diff --git a/clients/cli/meson.build b/clients/cli/meson.build
index b1b2426910..8dd05affcc 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 b0a6191c46..d8f96539e0 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 f68435ec9e..c32bb5e7cc 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 479cb78101..43b1f7c94d 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 8b2fa4421b..5e6dd6a4c8 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 db6bd429fd..4f945a695b 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 d543f7ea6f..f2af7b2072 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 b572d27da2..de08c91c62 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 7feb9597fc..d0637e9c57 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 83c915e585..5c6f6b12a7 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 30f82188f9..d4da41b0b9 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 1a73b4dd55..66cd31e899 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 53fcc96082..d1115c5ffa 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 7471ecad22..8eac711cad 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 172502a210..87f60f5f34 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 f25251fd78..dc7841799c 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 42340f6457..955e17766b 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 148841155c..58615e4df0 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 29a21db76a..325b18fb5e 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 76c3b2876d..59fb771dd9 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 f9130535c9..407d027e90 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 0d8a15bd57..60fa5734f2 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 a1e071ecd2..3565653ef1 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 66504a29e4..57f6b8ff37 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 0261ae0c2f..52d6d2aa68 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 c131946762..d0277c989d 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 d0b4d63ce9..a16e899f41 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 2b07b019b3..b90cde2a80 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 7ee9c601e7..606b3763ed 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 c8c5da536f..6843e284d4 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 f6db824d24..7b2e785604 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 7bb5bca7a9..2d26c65576 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 017dec5669..25f778ad7d 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 3e92681f91..4dbcc9af12 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 1dddfe4f0d..9a1fcc4b1b 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 2ac8ac1cb9..bed23ab9b5 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 37c5c1b44d..f6328db916 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 a5d1c4b474..79834d7faa 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 f0507c232b..638a01a2fc 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 2d874659c7..40a5c9dcc3 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 27e1b4d02c..8457e68aed 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 0e63183b5e..c2b77cb910 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 bb53d1ee47..1ddd4f8553 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 9f18a36b18..00404c71f0 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 ed6f801058..97252edc08 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 609fe663ac..67f055d9fe 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 031e2efdbc..59a647ccb1 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 6e4298997f..4584086ef7 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 09036f27c4..c056f3c221 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 5dd2873cc1..1d0908b9bc 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 bc816a8543..3f70a1d6ca 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 c81e24ad4c..349eebbac8 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 6f7173b6da..4a50bca978 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 0c458768f3..181a6bef0b 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 d9dd3edba5..e193ff96a3 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 216990457a..1ce61c90a2 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 0cabe771fe..7e2b44fbb7 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 1ca094b52c..a39e4e21e3 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 7bf9fda001..cd1dc3aa50 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 83981aaba7..cde0844be5 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 207d22f874..63012d106e 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 5c4fa3e2ad..9b87d772e1 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 e3ebfa199e..cfe9c61533 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 ac877e184a..df8d1cf803 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 bc0984f22e..1fe5ece5f7 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],