Short Description for Categories... have a description above & below product listings

[DrByte]

An even better way, which touches no core files, is to add this file to the plugin's files:

/admin/includes/extra_datafiles/sanitizer_categories_sub.php

<?php
$sanitizer = AdminRequestSanitizer::getInstance();
$group = array(
  'categories_description_sub' => array('sanitizerType' => 'PRODUCT_DESC_REGEX', 'method' => 'post'),
    );
$sanitizer->addComplexSanitization($group);