Using Kick() method correctly? Need help understanding.

I know :Kick() kicks a player. But how do I add a custom message? for example "You have been kicked because the opponent left" or something? When I use Kick() it only kicks them.

On wiki;

void Kick ( string message = "" )

I'm not sure how to use it?

Maybe it's :Kick('You have been kicked due to smething')

or

:Kick(string message = "You have been kicked due to something")

or maybe something else, I'm sorry I don't understand but I barely know what Roblox wiki is talking about.