diff --git a/Doc/whatsnew/3.10.rst b/Doc/whatsnew/3.10.rst
index b0920294572b55..8fd64f86b3a2f5 100644
--- a/Doc/whatsnew/3.10.rst
+++ b/Doc/whatsnew/3.10.rst
@@ -1838,6 +1838,10 @@ New Features
creating type instances.
(Contributed by Victor Stinner in :issue:`43916`.)
+* Add a new :c:data:`Py_TPFLAGS_IMMUTABLETYPE` type flag for creating immutable
+ type objects: type attributes cannot be set nor deleted.
+ (Contributed by Victor Stinner and Erlend E. Aasland in :issue:`43908`.)
+
Porting to Python 3.10
----------------------
@@ -1895,6 +1899,12 @@ Porting to Python 3.10
been included directly, consider including ``Python.h`` instead.
(Contributed by Nicholas Sim in :issue:`35134`)
+* Use the :c:data:`Py_TPFLAGS_IMMUTABLETYPE` type flag to create immutable type
+ objects. Do not rely on :c:data:`Py_TPFLAGS_HEAPTYPE` to decide if a type
+ object is mutable or not; check if :c:data:`Py_TPFLAGS_IMMUTABLETYPE` is set
+ instead.
+ (Contributed by Victor Stinner and Erlend E. Aasland in :issue:`43908`.)
+
Deprecated
----------
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