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-rw-r--r--Doc/library/sys.rst5
1 files changed, 5 insertions, 0 deletions
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index c0b767f7c7..11605498ad 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -834,6 +834,11 @@ always available.
.. versionadded:: 2.4
+ .. impl-detail::
+
+ This function is intimately bound to CPython implementation details and
+ thus not likely to be implemented elsewhere.
+
.. data:: stdin
stdout