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-rw-r--r--doc/posix-functions/mbstowcs.texi6
1 files changed, 5 insertions, 1 deletions
diff --git a/doc/posix-functions/mbstowcs.texi b/doc/posix-functions/mbstowcs.texi
index 5d7dc4ca62..a695edc2af 100644
--- a/doc/posix-functions/mbstowcs.texi
+++ b/doc/posix-functions/mbstowcs.texi
@@ -4,10 +4,14 @@
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/mbstowcs.html}
-Gnulib module: ---
+Gnulib module: mbstowcs
Portability problems fixed by Gnulib:
@itemize
+@item
+In the C or POSIX locales, this function can return @code{(size_t) -1}
+and set @code{errno} to @code{EILSEQ}:
+glibc 2.35.
@end itemize
Portability problems not fixed by Gnulib: