diff --git a/Doc/c-api/long.rst b/Doc/c-api/long.rst
index af86810c6b166b..972d69a5194511 100644
--- a/Doc/c-api/long.rst
+++ b/Doc/c-api/long.rst
@@ -350,6 +350,9 @@ distinguished from a number.  Use :c:func:`PyErr_Occurred` to disambiguate.
    Exactly what values are considered compact is an implementation detail
    and is subject to change.
 
+   .. versionadded:: 3.12
+
+
 .. c:function:: Py_ssize_t PyUnstable_Long_CompactValue(const PyLongObject* op)
 
    If *op* is compact, as determined by :c:func:`PyUnstable_Long_IsCompact`,
@@ -357,3 +360,5 @@ distinguished from a number.  Use :c:func:`PyErr_Occurred` to disambiguate.
 
    Otherwise, the return value is undefined.
 
+   .. versionadded:: 3.12
+