Set the baking stone on the bottom rack of a cold oven, and preheat the oven to 500 degrees Fahrenheit for at least one hour to heat the stone throughout.
Combine 2 cups of finely ground whole wheat flour, 1 teaspoon of salt and 1 cup of warm water to form a soft dough.
Knead the dough for 10 minutes or until it becomes slightly elastic.
Divide the dough into 10 equal pieces.
Roll each dough ball into a 5-inch round, 1/4 to 1/2 inch thick.
Lay the rolled chapatis onto the preheated baking stone in the oven.
Cook the chapatis for 2 minutes in the oven.
Lift the baked chapatis from the baking stone with a long-handled spatula and serve them immediately.