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diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index cc48597ef9..ba5c388622 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -1829,6 +1829,9 @@ are always available. They are listed here in alphabetical order.
Negative values for *level* are no longer supported (which also changes
the default value to 0).
+ .. versionchanged:: 3.9
+ When the command line options :option:`-E` or :option:`-I` are being used,
+ the environment variable :envvar:`PYTHONCASEOK` is now ignored.
.. rubric:: Footnotes