Comment that getfilesystemencoding returns mbcs even on NT+. Fixes #964870.
diff --git a/Doc/lib/libsys.tex b/Doc/lib/libsys.tex
index 8d66c76..3b25e5a 100644
--- a/Doc/lib/libsys.tex
+++ b/Doc/lib/libsys.tex
@@ -228,7 +228,10 @@
according to the result of nl_langinfo(CODESET), or None if
the nl_langinfo(CODESET) failed.
\item On Windows NT+, file names are Unicode natively, so no conversion
- is performed.
+ is performed. \code{getfilesystemencoding} still returns ``mbcs'',
+ as this is the encoding that applications should use when they
+ explicitly want to convert Unicode strings to byte strings that
+ are equivalent when used as file names.
\end{itemize}
\versionadded{2.3}
\end{funcdesc}