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diff --git a/Doc/c-api/arg.rst b/Doc/c-api/arg.rst
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--- a/Doc/c-api/arg.rst
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@@ -45,6 +45,7 @@ in any early abort case).
Unless otherwise stated, buffers are not NUL-terminated.
.. note::
+
For all ``#`` variants of formats (``s#``, ``y#``, etc.), the type of
the length argument (int or :c:type:`Py_ssize_t`) is controlled by
defining the macro :c:macro:`PY_SSIZE_T_CLEAN` before including