After washing your wok, dry it on the stove with flame/heat until all the water has evaporated, and put 1/2 teaspoon vegetable oil in the wok. Use a napkin or paper towel to wipe down the entire surface of the wok and coat it with oil. Just a light coating should do it. This prevents rusting and helps with seasoning. Check out our article on how to wash a wok for more details!