Link-to class when not active

I have a link to helper that generate a <span>. The <span> should:

1. have the class:"arrow open" when it is active.


2. 
   

   have the class:"arrow" when it is NOT active.

   
   

   {{#link-to 'status' tagName="span" activeClass="arrow open"}} {{/link-to}}

   
   

Question: The point 1 is working with the use of the activeClass. However, I don't how to assign a class when the link-to helper is not active as per the point 2.

tks