Jabo

Hi folks, I have a question regarding the construction/setup of the cooler. On the cooler are two power supply cable (3-pin). The first one is connected to the fan cable, as described in the installation guide (step 2). The second cable should be plugged into the motherboard? Is my assumption correct? What surprises me is, that in the installation guide there is only one power supply cable for the CPU cooler and not two? Would be very grateful for help. Best regards Jabo