Product extraContent

[Promokit]

I would like to create additional tab for a product page.

 

In the product.tpl file I see following code special for extra content:

{foreach from=$product.extraContent item=extra key=extraKey}
...
{/foreach}

But how to add "extraContent" from a module?

 

I really appreciate any help.

[bellini13]

there are several modules on the marketplace that do this for you.

[Promokit]

Thank you for your advice, but I would like to do that myself