diff -r 76ab3c71aff2 -r c67bcee93248 doc/book/additionnal_services/index.rst
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+Additional services
+===================
+
+In this chapter, we introduce services crossing the *web -
+repository - administration* organisation of the first parts of the
+CubicWeb book. Those services can be either proper services (like the
+undo functionality) or mere *topical cross-sections* across CubicWeb.
+
+.. toctree::
+   :maxdepth: 2
+
+   undo
+
+