How do you add cocoa to cake flour?

To add cocoa to cake flour, first measure the desired amount of cocoa powder, typically around 1/4 to 1/3 cup for a standard cake recipe. Then, sift the cocoa powder together with the cake flour to ensure even distribution and to prevent lumps. Adjust the total amount of flour in the recipe by subtracting the amount of cocoa added to maintain the correct dry ingredient balance. Finally, proceed with your recipe as usual.