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diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
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--- a/Doc/library/sys.rst
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@@ -667,7 +667,7 @@ always available.
an underscore, and are not described here. Regardless of its contents,
:data:`sys.implementation` will not change during a run of the interpreter,
nor between implementation versions. (It may change between Python
- language versions, however.) See `PEP 421` for more information.
+ language versions, however.) See :pep:`421` for more information.
.. versionadded:: 3.3