diff --git a/doc/DocBook/Makefile b/doc/DocBook/Makefile
index 9caa512..820b1fb 100644
--- a/doc/DocBook/Makefile
+++ b/doc/DocBook/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 ###
 # This makefile is used to generate the kernel documentation,
 # primarily based on in-line comments in various source files.
@@ -5,9 +6,6 @@
 # to document the SRC - and how to read it.
 # To add a new book the only step required is to add the book to the
 # list of DOCBOOKS.
-#
-# SPDX-License-Identifier:	GPL-2.0
-#
 
 DOCBOOKS := linker_lists.xml stdio.xml