This section of the vinaya contains a single text (D.6), which discusses issues of monastic conduct that are considered to be “small” or “minor” (ཕྲན་ཚེགས་, phran tshegs, kṣudraka). Despite the subject matter, the work comprises a full two volumes, and in Situ’s catalog is classified as one of the major sections of the vinaya.
Sources:
Gregory Schopen, “Vinaya,” in Encyclopedia of Buddhism, vol. 2, ed. Robert E. Buswell (New York: Macmillan Reference USA, 2003): p. 888.