diff --git a/Doc/library/ctypes.rst b/Doc/library/ctypes.rst
index 535c5173be50de..d76b8d4809c078 100644
--- a/Doc/library/ctypes.rst
+++ b/Doc/library/ctypes.rst
@@ -2589,6 +2589,8 @@ fields, or any other data types containing pointer type fields.
the structure when being packed or unpacked to/from memory.
Setting this attribute to 0 is the same as not setting it at all.
+ .. versionadded:: 3.13
+
.. attribute:: _layout_
An optional string naming the struct/union layout. It can currently
diff --git a/Doc/whatsnew/3.13.rst b/Doc/whatsnew/3.13.rst
index a47d5e077a357b..565f74149725d5 100644
--- a/Doc/whatsnew/3.13.rst
+++ b/Doc/whatsnew/3.13.rst
@@ -814,6 +814,10 @@ ctypes
See :gh:`124520` for discussion and links to changes in some affected
projects.
+* :class:`ctypes.Structure` objects have a new :attr:`~ctypes.Structure._align_`
+ attribute which allows the alignment of the structure being packed to/from
+ memory to be specified explicitly.
+ (Contributed by Matt Sanderson in :gh:`112433`)
dbm
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