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index 4ec846b38..35812b13f 100644
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+++ b/doc/context/sources/general/manuals/luametatex/luametatex-differences.tex
@@ -119,6 +119,11 @@ principle \DVI\ and \PDF\ unaware. There are only generic whatsit nodes that can
be used for some management related tasks. For instance you can use them to
implement user nodes.
+The margin kern nodes are gone and we now use regular kern nodes for them. As a
+consequence there are two extra subtypes indicating the injected left or right
+kern. The glyph field served no real purpose so there was no reason for a special
+kind of node.
+
The \KPSE\ library is no longer built|-|in. Because there is no backend, quite
some file related callbacks could go away. The following file related callbacks
remained (till now):