--- IO-AIO/AIO.pm	2012/07/30 16:46:30	1.232
+++ IO-AIO/AIO.pm	2012/08/13 01:02:30	1.234
@@ -364,7 +364,7 @@
 =item aio_open $pathname, $flags, $mode, $callback->($fh)
 
 Asynchronously open or create a file and call the callback with a newly
-created filehandle for the file.
+created filehandle for the file (or C<undef> in case of an error).
 
 The pathname passed to C<aio_open> must be absolute. See API NOTES, above,
 for an explanation.
@@ -1279,9 +1279,9 @@
 
 =item aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents)
 
-Queries the extents of the given file (by calling the Linux FIEMAP ioctl,
-see L<http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for details). If the
-C<ioctl> is not available on your OS, then this request will fail with
+Queries the extents of the given file (by calling the Linux C<FIEMAP>
+ioctl, see L<http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for details). If
+the ioctl is not available on your OS, then this request will fail with
 C<ENOSYS>.
 
 C<$start> is the starting offset to query extents for, C<$length> is the