I needed to overide a function in my template.php in my theme:
function blogbuzz_views_bulk_operations_fields_action_form($form) {
$output = '';
$access = user_access('Use PHP input for field settings (dangerous - grant with care)');
if ($access && $form['#settings']['php_code']) {
$output .= t('<h3>Using the Code widget</h3>
<ul>
<li>Will override the value specified in the Field widget.</li>
<li>Should include <?php ?> delimiters.</li>
<li>If in doubt, refer to <a target="_blank" href="@link_devel">devel.module</a> \'Dev load\' tab on a content page to figure out the expected format.</li>
</ul>', array('@link_devel' => 'http://www.drupal.org/project/devel')
);
}
}