a year before the end of the war, the icrc received the 1917 nobel peace prize for its outstanding wartime work. it was the only nobel peace prize awarded in the period from 1914 to 1918. in 1923, the committee adopted a change in its policy regarding the selection of new members. until then, only citizens from the city of geneva could serve in the committee. this limitation was expanded to include swiss citizens. as a direct consequence of world war i, an additional protocol to the geneva convention was adopted in 1925 which outlawed the use of suffocating or poisonous gases and biological agents as weapons. four years later, the original convention was revised and the second geneva convention "relative to the treatment of prisoners of war" was established. the events of world war i and the respective activities of the icrc significantly increased the reputation and authority of the committee among the international community and led to an extension of its competencies.