I didn't know so I looked it up. It would seem your wife is right. Allrecipies.com says that the ingredients for homemade pancakes are as follows:
3/4 cup milk
2 tablespoons white vinegar
1 cup all-purpose flour
2 tablespoons white sugar
1 teaspoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
1 egg
2 tablespoons butter, melted
cooking spray