Dosa usually have seasonings in the batter such as finely chopped green chillies, black mustard seeds, grated ginger and chopped coriander. They taste great this way. Add as much or as little as you like. I love mine with ginger and chilli.
One other thing, traditional dosa batter is much thicker and spread with the back of a spoon around the pan. This instant variety is thinner and poured.