aio_return man page different from aio_read

Hello

aio_read also describes aio_return will return -1 on error:

http://www.kernel.org/doc/man-pages/online/pages/man3/aio_read.3.html

However, aio_return man page does not explain this, it says the error 
code returned directly:

"If the asynchronous I/O operation has completed, this function returns the
        value that would have been returned in case of a synchronous 
read(2),
        write(2), fsync(2) or fdatasync(2), call."

http://www.kernel.org/doc/man-pages/online/pages/man3/aio_return.3.html


I don't know which is correct.

Best regards, Jon
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