When a player's character increases their Con score at any level does that change their max Hit Points?
For example, a cleric has HP equal to 12+Con at 1st level and has a 16 Con. And at levels 4, 8, 11, and so on I could add +1 to two scores, and I choose Con for one of them every time. So at level 4 the cleric's Con goes to 17, at level 8 it becomes 18 Con, at level 11 it's 19 Con, and so on.
Though it seems small, should I add that +1 my Hit Points as well when my Con increases?