Improve doc of dirfd module.

[gnulib.git] / doc / posix-functions / dirfd.texi

diff --git a/doc/posix-functions/dirfd.texi b/doc/posix-functions/dirfd.texi
index 601fab8..d79c2db 100644 (file)
--- a/doc/posix-functions/dirfd.texi
+++ b/doc/posix-functions/dirfd.texi
@@ -10,12 +10,16 @@ Portability problems fixed by Gnulib:
 @itemize
 @item
 This function is missing on some platforms:
-AIX 5.1, HP-UX 11, OSF/1 5.1, Solaris 10.
+AIX 5.1, HP-UX 11, OSF/1 5.1, Solaris 10, mingw.
 @end itemize
 
 Portability problems not fixed by Gnulib:
 @itemize
 @item
-This function is missing on some platforms:
+This function always fails on some platforms:
 mingw.
 @end itemize
+
+With the @code{dirfd} module, this functions always sets @code{errno} when it
+fails. (POSIX does not require that @code{dirfd} sets @code{errno} when it
+fails.)