diff --git a/doc/devel/UML/iso_tree.violet b/doc/devel/UML/iso_tree.violet
index 28d75ce..d3c6299 100644
--- a/doc/devel/UML/iso_tree.violet
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@@ -436,8 +398,8 @@ We don't show the several functions in Dir to manage the tree.
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{create}
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