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-rw-r--r--book/index_book.rst2
1 files changed, 2 insertions, 0 deletions
diff --git a/book/index_book.rst b/book/index_book.rst
index 2dc5511..62dfc5d 100644
--- a/book/index_book.rst
+++ b/book/index_book.rst
@@ -1,3 +1,5 @@
+.. comment SPDX-License-Identifier: CC-BY-SA-4.0
+
.. highlight:: c
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