diff --git a/Doc/c-api/structures.rst b/Doc/c-api/structures.rst
index 5535f42..b2392fa 100644
--- a/Doc/c-api/structures.rst
+++ b/Doc/c-api/structures.rst
@@ -88,13 +88,13 @@
    .. versionadded:: 3.9
 
 
-.. c:macro:: Py_REFCNT(o)
+.. c:function:: Py_ssize_t Py_REFCNT(const PyObject *o)
 
-   This macro is used to access the :attr:`ob_refcnt` member of a Python
-   object.
-   It expands to::
+   Get the reference count of the Python object *o*.
 
-      (((PyObject*)(o))->ob_refcnt)
+   .. versionchanged:: 3.10
+      :c:func:`Py_REFCNT()` is changed to the inline static function.
+      Use :c:func:`Py_SET_REFCNT()` to set an object reference count.
 
 
 .. c:function:: void Py_SET_REFCNT(PyObject *o, Py_ssize_t refcnt)
@@ -104,12 +104,13 @@
    .. versionadded:: 3.9
 
 
-.. c:macro:: Py_SIZE(o)
+.. c:function:: Py_ssize_t Py_SIZE(const PyVarObject *o)
 
-   This macro is used to access the :attr:`ob_size` member of a Python object.
-   It expands to::
+   Get the size of the Python object *o*.
 
-      (((PyVarObject*)(o))->ob_size)
+   .. versionchanged:: 3.10
+      :c:func:`Py_SIZE()` is changed to the inline static function.
+      Use :c:func:`Py_SET_SIZE()` to set an object size.
 
 
 .. c:function:: void Py_SET_SIZE(PyVarObject *o, Py_ssize_t size)