diff --git a/Doc/whatsnew/3.6.rst b/Doc/whatsnew/3.6.rst
index 0517ef8376f..4cf77f9e2c8 100644
--- a/Doc/whatsnew/3.6.rst
+++ b/Doc/whatsnew/3.6.rst
@@ -450,6 +450,12 @@ Any code relying on the presence of ``default_format`` may
 need to be adapted. See :issue:`27819` for more details.
 
 
+encodings
+---------
+
+On Windows, added the ``'oem'`` encoding to use ``CP_OEMCP`` and the ``'ansi'``
+alias for the existing ``'mbcs'`` encoding, which uses the ``CP_ACP`` code page.
+
 faulthandler
 ------------
 
diff --git a/Misc/NEWS b/Misc/NEWS
index f5e8aaa50f9..f3b0acb14df 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -237,6 +237,9 @@ Build
 Windows
 -------
 
+- Issue #27959: Adds oem encoding, alias ansi to mbcs, move aliasmbcs to
+  codec lookup.
+
 - Issue #27982: The functions of the winsound module now accept keyword
   arguments.