diff --git a/Doc/c-api/typeobj.rst b/Doc/c-api/typeobj.rst
index 9efe3aac2e1c9f..289aabf6719c22 100644
--- a/Doc/c-api/typeobj.rst
+++ b/Doc/c-api/typeobj.rst
@@ -2357,6 +2357,8 @@ Async Object Structures
    See :c:func:`PyIter_Send` for details.
    This slot may be set to ``NULL``.
 
+   .. versionadded:: 3.10
+
 
 .. _slot-typedefs: