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-rw-r--r--Doc/library/sys.rst4
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diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index c1a0027..6b9377d 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -816,6 +816,10 @@ always available.
available only if Python was compiled with :option:`--with-tsc`. To understand
the output of this dump, read :file:`Python/ceval.c` in the Python sources.
+ .. impl-detail::
+ This function is intimately bound to CPython implementation details and
+ thus not likely to be implemented elsewhere.
+
.. data:: stdin
stdout