bpo-31861: Complete the C-API docs for PyObject_GetAiter and PyAiter_Check (GH-25004)
diff --git a/Doc/c-api/iter.rst b/Doc/c-api/iter.rst
index 5706777..63290e0 100644
--- a/Doc/c-api/iter.rst
+++ b/Doc/c-api/iter.rst
@@ -12,6 +12,12 @@
Return non-zero if the object *o* supports the iterator protocol, and ``0``
otherwise. This function always succeeds.
+.. c:function:: int PyAiter_Check(PyObject *o)
+
+ Returns non-zero if the object 'obj' provides :class:`AsyncIterator`
+ protocols, and ``0`` otherwise. This function always succeeds.
+
+ .. versionadded:: 3.10
.. c:function:: PyObject* PyIter_Next(PyObject *o)