drupal view theming order by taxonomy term

Question

I have a view who gets all the nodes from a certain type and shows them on a page. Every node is categorized by a taxonomy term. I created a custom .tpl file to theme the view using row style.

But what i really would like to do is order all the nodes under a category.

example:

**category 1**
node 1
node 7
node 15

**category 2**
node 2
node 6

...

how do I do this?