mkr1000 with 5V sensor

Hi,

in the documentation it is mentioned (https://www.arduino.cc/en/Guide/MKR1000) that 5V sensors should not be used witht the MKR1000... What is the 5V pin for on the board if this kill it? I have a DHT11 humidity sensor that actually works with the mkr1000 (when connected via USB). What do you suggest on how to work both together?

Thanks for your kind help.