A question about a recipe: Spring Macaron

I have a question about step 1 on the recipe "Spring Macaron" from Velvet Macaron. It says:

"Cream butter and cream cheese together. Add milk, vanilla and 2 cups of powdered sugar. Beat to combine. Add 1 more cup of flour. If it is too thin, add more powdered sugar. I like mine a bit thicker for macarons. Chill for about 2 hours. "

Does the author mean, "Add 1 more cup of SUGAR" rather than flour? Flour isn't listed in the ingredients