diff --git a/README.md b/README.md
index 582c308..65e8ce0 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@ Using some __openrc__ scripts with __systemd__ and other init systems
 
 (C) Martin Väth (martin at mvath.de).
 The license of this package is the GNU Public License GPL-2.
+SPDX-License-Identifier: GPL-2.0-only
 
 This script has been splitted from the **squash_dir** project
 
diff --git a/bin/openrc-wrapper b/bin/openrc-wrapper
index 6e83742..0150bca 100755
--- a/bin/openrc-wrapper
+++ b/bin/openrc-wrapper
@@ -1,4 +1,6 @@
 #!/bin/sh
+# (C) Martin V\"ath <martin at mvath.de>
+# SPDX-License-Identifier: GPL-2.0-only
 wrapper_usage() {
 	printf '%s\n' "Usage: ${0##*/} SCRIPT [-q] argument
 Execute /etc/init.d/SCRIPT [-q] argument, somewhat emulating the
diff --git a/systemd/system/modules.service b/systemd/system/modules.service
index 768cac9..02470ff 100644
--- a/systemd/system/modules.service
+++ b/systemd/system/modules.service
@@ -1,3 +1,5 @@
+# (C) Martin V\"ath <martin at mvath.de>
+# SPDX-License-Identifier: GPL-2.0-only
 [Unit]
 Description=Start kernel modules from openrc
 DefaultDependencies=no
diff --git a/systemd/system/openrdate.service b/systemd/system/openrdate.service
index 616b570..b3279ba 100644
--- a/systemd/system/openrdate.service
+++ b/systemd/system/openrdate.service
@@ -1,3 +1,5 @@
+# (C) Martin V\"ath <martin at mvath.de>
+# SPDX-License-Identifier: GPL-2.0-only
 [Unit]
 Description=Start openrdate to fetch time from some ntp server
 After=network-online.target
diff --git a/zsh/_openrc-wrapper b/zsh/_openrc-wrapper
index f1b754d..97e009b 100644
--- a/zsh/_openrc-wrapper
+++ b/zsh/_openrc-wrapper
@@ -1,4 +1,6 @@
 #compdef openrc-wrapper
+# (C) Martin V\"ath <martin at mvath.de>
+# SPDX-License-Identifier: GPL-2.0-only
 _arguments : \
 '-q[quiet\: Suppress standard output]' \
 '1:inits:compadd -- /etc/init.d/*(:t)' \