bpo-42171: Add PEP573-related items to the limited API (GH-23009)
diff --git a/Doc/c-api/structures.rst b/Doc/c-api/structures.rst
index 03fe479..37602ed 100644
--- a/Doc/c-api/structures.rst
+++ b/Doc/c-api/structures.rst
@@ -263,10 +263,12 @@
of :c:type:`PyObject*` values indicating the arguments and the third
parameter is the number of arguments (the length of the array).
- This is not part of the :ref:`limited API <stable>`.
-
.. versionadded:: 3.7
+ .. versionchanged:: 3.10
+
+ ``METH_FASTCALL`` is now part of the stable ABI.
+
.. data:: METH_FASTCALL | METH_KEYWORDS