diff --git a/poky/documentation/kernel-dev/kernel-dev.xml b/poky/documentation/kernel-dev/kernel-dev.xml
index 998fe41..887ff83 100755
--- a/poky/documentation/kernel-dev/kernel-dev.xml
+++ b/poky/documentation/kernel-dev/kernel-dev.xml
@@ -1,6 +1,7 @@
 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 
 <book id='kernel-dev' lang='en'
       xmlns:xi="http://www.w3.org/2003/XInclude"