=head1 DESCRIPTION
-The B<first> function returns the UNIX timestamp of the first data sample for
-the specified RRA of the RRD file.
+The B<first> function returns the UNIX timestamp of the first data
+sample entered into the specified RRA of the RRD file.
=over 8
=item I<--rraindex number>
-The index number of the B<RRA> that is to be examined. If not specified, the
+The index number of the B<RRA> that is to be examined. If not specified, the
index defaults to zero. B<RRA> index numbers can be determined through
B<rrdtool info>.