After the First World War, he added a new Preface (6 July 1920) for the French and German editions, which was first published in the Communist International No. 18 (1921).
Setelah Perang Dunia I, ia menambahkan Kata Pengantar baru (6 Juli 1920) untuk edisi bahasa Prancis dan Jerman yang pertama kali diterbitkan di Communist International No. 18 (1921).