diff --git a/README.md b/README.md
index 06385fa..ae62823 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,4 @@
 # realtime-setup
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 The realtime-setup package
diff --git a/kernel-is-rt b/kernel-is-rt
index 6e8e8d4..2ec2bff 100755
--- a/kernel-is-rt
+++ b/kernel-is-rt
@@ -1,2 +1,3 @@
 #!/usr/bin/bash -e
+# SPDX-License-Identifier: GPL-2.0-or-later
 [ -e /sys/kernel/realtime ]
diff --git a/kernel-rt-protect.conf b/kernel-rt-protect.conf
index 8e4d76c..8a16088 100644
--- a/kernel-rt-protect.conf
+++ b/kernel-rt-protect.conf
@@ -1,2 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 [main]
 enabled=1
diff --git a/kernel-rt-protect.py b/kernel-rt-protect.py
index a7ecadf..0a594ba 100644
--- a/kernel-rt-protect.py
+++ b/kernel-rt-protect.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 from yum.plugins import TYPE_INTERACTIVE
 requires_api_version = '2.5'
 plugin_type = (TYPE_INTERACTIVE,)
diff --git a/realtime-entsk.service b/realtime-entsk.service
index 006402d..4372d2b 100644
--- a/realtime-entsk.service
+++ b/realtime-entsk.service
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 [Unit]
 Description=RT Enable Netsocket Timestap Static Key daemon
 After=syslog.target network.target
diff --git a/realtime-setup-kdump b/realtime-setup-kdump
index 2219153..923c3d3 100644
--- a/realtime-setup-kdump
+++ b/realtime-setup-kdump
@@ -6,6 +6,8 @@
 # optional argument --grub causes kdump kernel cmdline to
 # be added to rt kernel grub entries
 #
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
 
 me=$(basename $0)
 rpmcmd='rpm -q --last'
diff --git a/realtime-setup.service b/realtime-setup.service
index bea403e..aed8645 100644
--- a/realtime-setup.service
+++ b/realtime-setup.service
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
 [Unit]
 Description=RHEL-RT environment details setup
 After=syslog.target
@@ -9,4 +11,3 @@ ExecStart=/usr/bin/rt-setup
 
 [Install]
 WantedBy=multi-user.target
-
diff --git a/realtime-setup.sysconfig b/realtime-setup.sysconfig
index 41e3842..7894648 100644
--- a/realtime-setup.sysconfig
+++ b/realtime-setup.sysconfig
@@ -1,4 +1,6 @@
 #
 # Decide whether to turn off SLUB cpu_partial support
 #
+# SPDX-License-Identifier: GPL-2.0-or-later
+
 SLUB_CPU_PARTIAL="off"
diff --git a/realtime-setup.systemd b/realtime-setup.systemd
index 5fcf750..b6749ae 100755
--- a/realtime-setup.systemd
+++ b/realtime-setup.systemd
@@ -1,4 +1,5 @@
 #!/usr/bin/bash
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 on_rt () {
     if [ -f /sys/kernel/realtime ]; then
diff --git a/realtime-setup.sysvinit b/realtime-setup.sysvinit
index 45eb584..89d8def 100644
--- a/realtime-setup.sysvinit
+++ b/realtime-setup.sysvinit
@@ -2,6 +2,7 @@
 #
 # rt-setup - script to handle setup for running an RT kernel
 #
+# SPDX-License-Identifier: GPL-2.0-or-later
 # chkconfig:   2345 00 99
 # description: This script is used to setup services for use with a \
 #              realtime Linux kernel \
diff --git a/realtime.conf b/realtime.conf
index 237f3ed..82ec0b0 100644
--- a/realtime.conf
+++ b/realtime.conf
@@ -1,5 +1,6 @@
 # This file specifies reasonable default limits for users
 # who should be able to run realtime processes.
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # Such users must be added to group 'realtime' to be
 # affected by these limits.
diff --git a/rhel-rt.rules b/rhel-rt.rules
index 5084f69..23535ea 100644
--- a/rhel-rt.rules
+++ b/rhel-rt.rules
@@ -1,5 +1,7 @@
 # udev rules specific to RHEL-RT Realtime kernel
-
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
 # insure /dev/rtc points to /dev/rtc0
 # we use PROGRAM rather than SYMLINK because there is
 # a (good) possibility that a /dev/rtc device file
diff --git a/rtapp-example.sh b/rtapp-example.sh
index 0cca355..474dce7 100644
--- a/rtapp-example.sh
+++ b/rtapp-example.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/bash
-
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
 # the following is the chkconfig init header
 #
 # rtapp-example: processor frequency scaling support
diff --git a/slub_cpu_partial_off b/slub_cpu_partial_off
index ddf857f..a602034 100755
--- a/slub_cpu_partial_off
+++ b/slub_cpu_partial_off
@@ -3,6 +3,8 @@
 # shell script to turn SLUB cpu_partial logic off
 # for improved determinism
 #
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
 
 if [ "$(id -u)" != "0" ]; then
    echo "Must be root to run $(basename $0)"
diff --git a/what-do.txt b/what-do.txt
index f368b71..ed598cb 100644
--- a/what-do.txt
+++ b/what-do.txt
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
 Looking at the specfile, here's what realtime-setup gets you:
 
 1. Create a realtime group: