diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst
index 5fe1c7166fe6fb..ace814e577f1de 100644
--- a/Doc/whatsnew/3.8.rst
+++ b/Doc/whatsnew/3.8.rst
@@ -127,6 +127,10 @@ Optimizations
first introduced in Python 3.4. It offers better performance and smaller
size compared to Protocol 3 available since Python 3.0.
+* Removed one ``Py_ssize_t`` member from ``PyGC_Head``. All GC tracked
+ objects (e.g. tuple, list, dict) size is reduced 4 or 8 bytes.
+ (Contributed by Inada Naoki in :issue:`33597`)
+
Build and C API Changes
=======================
@@ -201,6 +205,10 @@ Changes in the Python API
* :func:`shutil.copyfile` default buffer size on Windows was changed from
16 KiB to 1 MiB.
+* ``PyGC_Head`` struct is changed completely. All code touched the
+ struct member should be rewritten. (See :issue:`33597`)
+
+
CPython bytecode changes
------------------------
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