I’d recommend making that “… and make sure everyone is okay with that up front.” As we said, the point of the game’s rules is that the players need to be onboard – not just informed. 
This isn’t a game where the GM should be telling the players “yeah, your character is dead”, even if they have a chance to “save” them via challenges – the GM and the players should come up with the story around what happens when the hero is incapacitated.
I mean, for NPCs, go to town! 
But for PCs, the player really needs to be on-board for this.
Of course, it’s your game and you can do what you want! :-) But you should know going in that any players who know the game’s rules might take issue with a different approach…