#3711: .dll isn't a valid Python extension anymore.
diff --git a/Doc/extending/windows.rst b/Doc/extending/windows.rst
index 1811277..1675a0d 100644
--- a/Doc/extending/windows.rst
+++ b/Doc/extending/windows.rst
@@ -102,10 +102,14 @@
and it should call :cfunc:`Py_InitModule` with the string ``"spam"`` as its
first argument (use the minimal :file:`example.c` in this directory as a guide).
By convention, it lives in a file called :file:`spam.c` or :file:`spammodule.c`.
- The output file should be called :file:`spam.dll` or :file:`spam.pyd` (the
- latter is supported to avoid confusion with a system library :file:`spam.dll` to
- which your module could be a Python interface) in Release mode, or
- :file:`spam_d.dll` or :file:`spam_d.pyd` in Debug mode.
+ The output file should be called :file:`spam.pyd` (in Release mode) or
+ :file:`spam_d.pyd` (in Debug mode). The extension :file:`.pyd` was chosen
+ to avoid confusion with a system library :file:`spam.dll` to which your module
+ could be a Python interface.
+
+ .. versionchanged:: 2.5
+ Previously, file names like :file:`spam.dll` (in release mode) or
+ :file:`spam_d.dll` (in debug mode) were also recognized.
Now your options are: