A dispensing cap is disclosed for mixing a primary flowable substance, such as a soap, lotion, or the like, with a small dose of a secondary flowable substance, such as a fragrance. The dispensing cap includes a plurality of reservoirs containing a plurality of secondary flowable substances. Each of the reservoirs is associated with a secondary piston that, when actuated, causes the secondary flowable substance to be expelled from the reservoir into a mixing chamber in the cap, where it is mixed with the primary flowable substance. Upon mixing the two are dispensed together from a dispensing end of the cap. A selector ring is provided to enable the user to select one of the plurality of reservoirs. The selector ring has an actuation flange that aligns with the secondary piston that is associated with the selected reservoir. The selector ring is engaged with the main piston so, as the primary flowable substance is introduced into the mixing chamber via movement of the main piston, the selector ring and flange are pressed down onto the selected secondary piston, which expels a quantity of selected secondary flowable substance into the mixing chamber. The mixing chamber may have mixing vanes or other physical features to enhance mixing of the primary and secondary flowable substances. The cap may have a lockout feature that prevents actuation if the selected reservoir is empty. The cap may also have a visual indicator that informs the user of a level of secondary flowable substance within the secondary reservoir.