#9451: strengthen warning about __*__ special name usage.
diff --git a/Doc/reference/lexical_analysis.rst b/Doc/reference/lexical_analysis.rst
index 1b8b7b5..51a291e 100644
--- a/Doc/reference/lexical_analysis.rst
+++ b/Doc/reference/lexical_analysis.rst
@@ -362,11 +362,12 @@
information on this convention.
``__*__``
- System-defined names. These names are defined by the interpreter and its
- implementation (including the standard library); applications should not expect
- to define additional names using this convention. The set of names of this
- class defined by Python may be extended in future versions. See section
- :ref:`specialnames`.
+ System-defined names. These names are defined by the interpreter and its
+ implementation (including the standard library). Current system names are
+ discussed in the :ref:`specialnames` section and elsewhere. More will likely
+ be defined in future versions of Python. *Any* use of ``__*__`` names, in
+ any context, that does not follow explicitly documented use, is subject to
+ breakage without warning.
``__*``
Class-private names. Names in this category, when used within the context of a