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diff --git a/Doc/whatsnew/3.3.rst b/Doc/whatsnew/3.3.rst
index 8cabab6..20e2914 100644
--- a/Doc/whatsnew/3.3.rst
+++ b/Doc/whatsnew/3.3.rst
@@ -939,6 +939,20 @@ Porting C code
:c:func:`PyUnicode_FromFormat()`, your code will automatically take
advantage of the new unicode representations.
+Building C extensions
+---------------------
+
+* The range of possible file names for C extensions has been narrowed.
+ Very rarely used spellings have been suppressed: under POSIX, files
+ named ``xxxmodule.so``, ``xxxmodule.abi3.so`` and
+ ``xxxmodule.cpython-*.so`` are no longer recognized as implementing
+ the ``xxx`` module. If you had been generating such files, you have
+ to switch to the other spellings (i.e., remove the ``module`` string
+ from the file names).
+
+ (implemented in :issue:`14040`.)
+
+
Other issues
------------