I just re-read the rules about monks and I wonder how to interprete this from the PHB:

Immediately after you take the Attack action on your turn, you can spend 1 ki point to make two unarmed strikes as a bonus action.

Is it allowed to spent one ki point only (per turn), because another ki point would not be spent immediately after the attack action? I had never a monk in my groups until now but always thought the answer would be yes.