Hello everybody!

I need to add a parameter to category in K2 back-end in order to use it in a view.
I've tried to add one:
<param name="num_leading_items_added" type="text" size="4" default="10" label="K2_LEADING_COUNT" description="K2_NUMBER_OF_ITEMS_TO_DISPLAY_AS_LEADING"/>
to
components\com_k2\views\itemlist\tmpl\category.xml
and
administrator\components\com_k2\models\category.xml

but I still can't see the parameter in a category in K2 back-end.

How can I add a parameter?

Thanks for advance!

You can create an extra field without changing core files

1) Create a folder under /plugins/k2 named catField, inside there
2) Create a file catField.php