Making intention of nafl salaah and fulfillment of a vow
Q: I made a vow to read two rakaats of salaah everytime I do a certain sin and double the amount of salaah if I do it again. I'm doing this in order to help me completely leave the sin out. I want to know, when I read this salaah, can I make two intentions in one? Example, I read this salaah at tahajjud time so I also make intention for tahajjud.