diff --git a/poky/documentation/dev-manual/dev-manual.xml b/poky/documentation/dev-manual/dev-manual.xml
index 6f86454..6643993 100755
--- a/poky/documentation/dev-manual/dev-manual.xml
+++ b/poky/documentation/dev-manual/dev-manual.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='dev-manual' lang='en'
       xmlns:xi="http://www.w3.org/2003/XInclude"