While this recipe calls for the use of simple and classic ingredients to make the chapatis, you can also throw in your choices of spices and ingredients to add to the flavor of the chapatis.  Cumin seeds and carom seeds are a couple of good options to consider, and if you want to improve the nutritive value of the chapatis, you can also add some ground flaxseeds into the dough.  Another great idea is to add some chopped greens like fenugreek leaves or spinach leaves into the dough.