diff --git a/documentation/mega-manual/mega-manual-customization.xsl b/documentation/mega-manual/mega-manual-customization.xsl
index b52b5b2aa3..33a6e16325 100644
--- a/documentation/mega-manual/mega-manual-customization.xsl
+++ b/documentation/mega-manual/mega-manual-customization.xsl
@@ -1,4 +1,5 @@
 <?xml version='1.0'?>
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns="http://www.w3.org/1999/xhtml" xmlns:fo="http://www.w3.org/1999/XSL/Format" version="1.0">
 
   <xsl:import href="http://downloads.yoctoproject.org/mirror/docbook-mirror/docbook-xsl-1.76.1/xhtml/docbook.xsl" />
diff --git a/documentation/mega-manual/mega-manual.xml b/documentation/mega-manual/mega-manual.xml
index e730f72596..d9912fa442 100755
--- a/documentation/mega-manual/mega-manual.xml
+++ b/documentation/mega-manual/mega-manual.xml
@@ -1,7 +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='mega-manual' lang='en'
       xmlns:xi="http://www.w3.org/2003/XInclude"
diff --git a/documentation/mega-manual/mega-style.css b/documentation/mega-manual/mega-style.css
index cd71eb6425..7748320fb2 100644
--- a/documentation/mega-manual/mega-style.css
+++ b/documentation/mega-manual/mega-style.css
@@ -1,4 +1,6 @@
 /*
+   SPDX-License-Identifier: CC-BY-2.0-UK
+
    Generic XHTML / DocBook XHTML CSS Stylesheet.
 
    Browser wrangling and typographic design by