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-rw-r--r--Doc/extending/newtypes.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/Doc/extending/newtypes.rst b/Doc/extending/newtypes.rst
index a69f114..4a6e26c 100644
--- a/Doc/extending/newtypes.rst
+++ b/Doc/extending/newtypes.rst
@@ -129,7 +129,9 @@ our objects and in some error messages, for example::
Note that the name is a dotted name that includes both the module name and the
name of the type within the module. The module in this case is :mod:`noddy` and
-the type is :class:`Noddy`, so we set the type name to :class:`noddy.Noddy`. ::
+the type is :class:`Noddy`, so we set the type name to :class:`noddy.Noddy`.
+One side effect of using an undotted name is that the pydoc documentation tool
+will not list the new type in the module documentation. ::
sizeof(noddy_NoddyObject), /* tp_basicsize */