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diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
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@@ -744,6 +744,11 @@ conflict.
:data:`sys.stdin` and :data:`sys.stdout` to ``surrogateescape``. This
behavior can be overridden using :envvar:`PYTHONIOENCODING` as usual.
+ For debugging purposes, setting ``PYTHONCOERCECLOCALE=warn`` will cause
+ Python to emit warning messages on ``stderr`` if either the locale coercion
+ activates, or else if a locale that *would* have triggered coercion is
+ still active when the Python runtime is initialized.
+
Availability: \*nix
.. versionadded:: 3.7