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-rw-r--r--winsup/doc/pathnames.sgml5
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diff --git a/winsup/doc/pathnames.sgml b/winsup/doc/pathnames.sgml
index ad1468462..0a9766c6a 100644
--- a/winsup/doc/pathnames.sgml
+++ b/winsup/doc/pathnames.sgml
@@ -368,6 +368,11 @@ filename because the question mark will not translate back to the original
Chinese character, but to a simple question mark instead. This in turn
results in strange "File not found" messages.</para>
+<note><para>In the default "C" locale, Cygwin creates filenames using
+the UTF-8 charset. This will always result in some valid filename by
+default, but again might impose problems when switching to a non-"C"
+or non-"UTF-8" charset.</para></note>
+
<note><para>To avoid this scenario altogether, always use UTF-8 as the
character set.</para></note>