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diff --git a/gnulib/doc/posix-functions/readlinkat.texi b/gnulib/doc/posix-functions/readlinkat.texi
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+@node readlinkat
+@section @code{readlinkat}
+@findex readlinkat
+
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/readlinkat.html}
+
+Gnulib module: readlinkat
+
+Portability problems fixed by Gnulib:
+@itemize
+@item
+This function is missing on some platforms:
+glibc 2.3.6, MacOS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8,
+AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x, mingw, MSVC 9, Interix 3.5, BeOS.
+But the replacement function is not safe to be used in libraries and is not multithread-safe.
+@end itemize
+
+Portability problems not fixed by Gnulib:
+@itemize
+@item
+This function always fails on platforms that don't support symlinks:
+mingw, MSVC 9.
+@item
+When @code{readlink} is called on a directory: In the case of NFS mounted
+directories, Cygwin sets @code{errno} to @code{ENOENT} or @code{EIO} instead of
+@code{EINVAL}.  To avoid this problem, check for a directory before calling
+@code{readlink}.
+@item
+When @code{readlink} is called on a file that is not a symbolic link:
+Irix may set @code{errno} to @code{ENXIO} instead of @code{EINVAL}.  Cygwin
+may set errno to @code{EACCES} instead of @code{EINVAL}.
+@item
+Symlink contents do not always have a trailing null byte, and there is
+no indication if symlink contents were truncated if the return value
+matches the length.  Furthermore, AIX 5.1 and HP-UX 11 set
+@code{errno} to @code{ERANGE} rather than returning truncated
+contents, and Linux sets @code{errno} to @code{EINVAL} if the
+requested length is zero.  Use the gnulib module areadlink for
+improved ability to read symlink contents.
+@end itemize