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-rw-r--r--doc/DocBook/Makefile3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/DocBook/Makefile b/doc/DocBook/Makefile
index 593237f..9caa512 100644
--- a/doc/DocBook/Makefile
+++ b/doc/DocBook/Makefile
@@ -5,6 +5,9 @@
# 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