Category field in magento 1

<?php
$this->startSetup();
$this->addAttribute( Mage_Catalog_Model_Category::ENTITY, 'extra_cms_block_head', array(
    'group'                    => 'General Information',
    'input'                    => 'textarea',
    'type'                     => 'text',
    'label'                    => 'Extra CMS-Block Head',
    'backend'                  => '',
    'visible'                  => true,
    'wysiwyg_enabled'          => true,
    'is_html_allowed_on_front' => true,
    'required'                 => false,
    'visible_on_front'         => true,
    'global'                   => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_STORE,
) );

$this->endSetup();