Starting Strength +

So 40 y/o, started again in december with weight lifting. Goal is to stay fit and build strength and cut some fat the first 12 weeks.

I'm in the opinion my arms/shoulders are lagging behind.

Is it advisable to train them after the 5x5 routine? So after the regular 3 exercises, add 2 sets for biceps/triceps/shoulders? I have an EZ bar and dumbbells for this.