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-rw-r--r--doc/posix-functions/btowc.texi3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/posix-functions/btowc.texi b/doc/posix-functions/btowc.texi
index b58fa848e8..913f84ad53 100644
--- a/doc/posix-functions/btowc.texi
+++ b/doc/posix-functions/btowc.texi
@@ -12,6 +12,9 @@ Portability problems fixed by Gnulib:
This function is missing on some platforms:
HP-UX 11.00, IRIX 5.3, Solaris 2.6, mingw, Interix 3.5.
@item
+This function returns WEOF for a NUL argument on some platforms:
+Cygwin 1.7.2.
+@item
This function does not return WEOF for an EOF argument on some platforms:
IRIX 6.5.
@end itemize