No oil. But more water yes and only in small amounts - wet your hands and then work the dough some more. If it gets too wet then add a bit more flour. The corn flour cannot be overworked because there is no gluten so don't be afraid to keep tinkering. It should be smooth and not sticky.
Recipe advice please!
Today is Satacoday (Taco Tuesday doesn't work, because we're out all day).
Out last taco day went well, but as we used masa harina, the tacos were too crumbly.
Adding strong bread flour to the maize flour is acceptable, right?