Customized…will update overwrite?

I edited the plugin files for formatting purposes: better-search.php, general-template.php, template.php. It all works..but I’m concerned that these changes will be overwritten when the plugin updates. Is that true? Thanks, Joel

1.better-search.php
commented out –
/* added by joel
$output .= ‘<p>’;
$output .= ‘<span class=”bsearch_score”>’ . get_bsearch_score( $search, $score, $topscore ) . ‘</span>’;

$before = __( ‘Posted on: ‘, ‘better-search’ );

$output .= ‘<span class=”bsearch_date”>’ . get_bsearch_date( $search, __( ‘Posted on: ‘, ‘better-search’ ) ) . ‘</span>’;
$output .= ‘</p>’;
*/
2.general-template.php
removed:
/** removed by joel
<tr class=”bsearch_nav_row2″>
<td style=”text-align:left”></td>’;
$output .= ‘<td style=”text-align:right”>’;
$output .= __( ‘Results per-page’, ‘better-search’ );
$output .= ‘: 10 | 20 | 50 | 100
</td>
</tr>
**/
3. template.php
added
<div id=”bsearchresults”>
<!– added by joel –>
<p></p>
<!– added by joel –>