In a bowl mix whole wheat flour, all purpose flour, salt and oil. Add water to make firm and smooth dough, adjust the water as needed.
Knead the dough on a lightly oiled surface. Dough should not be sticking to the fingers. Cover the dough and let it rest for about 10-15 minutes.
Knead the dough again and divide into 6 equal parts. Take one part of the dough and press it both sides in dry flour this will help rolling. Roll it thin into about 9” diameter. If the dough sticks to the rolling pin or rolling surface, lightly sprinkle the dry flour.
Heat the skillet over medium high. Checks the skillet if it is hot enough. Sprinkle few drops of water over the skillet, water should sizzle. Skillet should not be smoking.
Place the roti over skillet for about half a minute, roti will change in the color lightly and puff different places. Flip the roti over, and lightly press, flip it again roti should have light golden color on both sides.
Remove the roti from the skillet. Roti is ready. Make all the rotis, cover and set it aside.