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-rw-r--r--doc/posix-functions/towlower.texi3
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diff --git a/doc/posix-functions/towlower.texi b/doc/posix-functions/towlower.texi
index a8ef3ce990..b6c51a4571 100644
--- a/doc/posix-functions/towlower.texi
+++ b/doc/posix-functions/towlower.texi
@@ -23,6 +23,9 @@ Portability problems not fixed by Gnulib:
@item
On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and therefore cannot
accommodate all Unicode characters.
+However, the Gnulib function @code{c32tolower}, provided by Gnulib module
+@code{c32tolower}, operates on 32-bit wide characters and therefore does not
+have this limitation.
@item
This function returns wrong values even for the ASCII characters
in a zh_CN.GB18030 locale on some platforms: