It is highly recommended to write a short letter of motivation (1 page), detailing 1) your background, 2) why you think that you fit the program, and 3) your research interest and which of the seven specializations you would like to pursue within the program (Archaeobotany, Archaeometry, Geoarchaeology, Paleoanthropology, Paleogenetics, Stone Age Archaeology, or Zooarchaeology). The professors will take the final decision on your application and a letter of motivation can always be helpful with that.