Write the next sentence in the following story.

How to thicken frosting
Add more powdered sugar.
Most frostings contain powdered sugar, and the most common way to thicken a runny frosting is by gradually mixing in a bit more powdered sugar to offset the liquid ingredients.
Only add the sugar a little at a time.

Options: +Where required, spoon additional powdered sugar into the mixture until you reach the desired consistency, if it isn't already runny. The consistency will have a little crunch to it when you first add the frosting to thicken it in recipes.. +Sprinkle an additional 1 to 2 tbsp (15 to 30 ml) into the frosting and mix well. If you add too much at once, the frosting will become too sweet and may become too thick.. +Just a little at a time, or you won't get the flavors mixed properly. You want the frosting thickened to the consistency of conventional condiments, but the actual texture of the frosting should be somewhere between flat and thick.. +If you add in too much added sugar, you won't be able to firm the frosting enough to thicken it properly. If you pour in a little more powdered sugar to balance the thickening liquid, add less sugar... The answer should be
Sprinkle an additional 1 to 2 tbsp (15 to 30 ml) into the frosting and mix well. If you add too much at once, the frosting will become too sweet and may become too thick.