Credits to Mark, and here is how I did it, this is my `/etc/fstab`:

    proc            /proc           proc    defaults          0       0
    /dev/mmcblk0p6  /boot           vfat    defaults          0       2
    /dev/mmcblk0p7  /               ext4    defaults,noatime  0       1
    /dev/sda1       /media/pi/USB   ext4    defaults,rw       0       3
    # a swapfile is not a swap partition, no line here
    #   use  dphys-swapfile swap[on|off]  for that

I've just added the line that starts with `/dev/sda1`. What I've read on forums it is important to keep in mind that you can apply the trick above only when you are using 1 USB storage device. When you have multiple, you have to work with UUID's. It's well explained [here][1].

Oh and for an explanation of the different columns you see in my code you can check [here][2]. 


  [1]: http://elinux.org/RPi_Adding_USB_Drives
  [2]: http://www.howtogeek.com/howto/38125/htg-explains-what-is-the-linux-fstab-and-how-does-it-work/