problem cache hook

Hello I am using your plugin on a site with divi. I created a feature that displays a list of contributor to the site with a shortcode. This functionality I have coded in functions.php. The problem is that when I add a contributor, each time I empty the cache via your plugin for the contributor to appear in this list. I saw your doc which forces the cache with this:
wpfc_clear_post_cache_by_id (1923);

Being a beginner for hooks I would like to know how should I place this function. Do I just have to put this snippet of code in my function that generates the shortcode for it to work?