diff --git a/view/book_list.xml b/view/book_list.xml
index 2189834..f874535 100644
--- a/view/book_list.xml
+++ b/view/book_list.xml
@@ -6,9 +6,18 @@ full copyright notices and license terms. -->
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diff --git a/view/book_tree.xml b/view/book_tree.xml
index 2bb9983..ce3eddc 100644
--- a/view/book_tree.xml
+++ b/view/book_tree.xml
@@ -5,8 +5,19 @@ full copyright notices and license terms. -->
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