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-rw-r--r--Doc/library/enum.rst8
1 files changed, 7 insertions, 1 deletions
diff --git a/Doc/library/enum.rst b/Doc/library/enum.rst
index 6837b45..21f41b7 100644
--- a/Doc/library/enum.rst
+++ b/Doc/library/enum.rst
@@ -861,9 +861,15 @@ Supported ``_sunder_`` names
For :class:`Flag` classes the next value chosen will be the next highest
power-of-two.
+- While ``_sunder_`` names are generally reserved for the further development
+ of the :class:`Enum` class and can not be used, some are explicitly allowed:
+
+ - ``_repr_*`` (e.g. ``_repr_html_``), as used in `IPython's rich display`_
+
.. versionadded:: 3.6 ``_missing_``, ``_order_``, ``_generate_next_value_``
.. versionadded:: 3.7 ``_ignore_``
-.. versionadded:: 3.13 ``_add_alias_``, ``_add_value_alias_``
+.. versionadded:: 3.13 ``_add_alias_``, ``_add_value_alias_``, ``_repr_*``
+.. _`IPython's rich display`: https://ipython.readthedocs.io/en/stable/config/integrating.html#rich-display
---------------