Adding a specific Fontawesome icon on Woocommece tab titles

I'm trying to add a custom fontawesome icon on each of my Woocommerce tabs, you know, the ones in the product pages : Description / Additional information / Reviews.

I tried something like this :

 li.additional_information_tab::before {  content: "\f005";   font-family: FontAwesome;  padding: 0 10px 0 0; display: inline-block;}

I'm expecting to get the icon (one specific icon for each tab title) to be displayed right before the tab title, but the icon displays on a line, and the tab title on the line after, I'm pretty sure I'm not doing it right, would someone have some idea about that ?