In liturgical use, and in most printed editions of "Avot", a sixth chapter, "Kinyan Torah" ("Acquisition of Torah") is added; this is in fact the eighth (in the Vilna edition) chapter of tractate "Kallah", one of the minor tractates. It is added because its content and style are somewhat similar to that of the original tractate Avot (although it focuses on Torah study more than ethics), and to allow for one chapter to be recited on each "Shabbat" of the Omer period, this chapter being seen well-suited to "Shabbat Shavuot", when the giving of the Torah is celebrated. (See below.) The term "Pirkei Avot" refers to the composite six-chapter work ("Avot" plus "Kinyan Torah").