diff --git a/Doc/c-api/typeobj.rst b/Doc/c-api/typeobj.rst
index 82f2ab53451166..ea811158fa8739 100644
--- a/Doc/c-api/typeobj.rst
+++ b/Doc/c-api/typeobj.rst
@@ -2453,6 +2453,8 @@ Async Object Structures
    See :c:func:`PyIter_Send` for details.
    This slot may be set to ``NULL``.
 
+   .. versionadded:: 3.10
+
 
 .. _slot-typedefs: