book_entity_info_alter(&$info)Implements hook_entity_info_alter().
modules/book/book.module, line 237
<?php
function book_entity_info_alter(&$info) {
// Add the 'Print' view mode for nodes.
$info['node']['view modes'] += array(
'print' => array(
'label' => t('Print'),
),
);
}
?>