Another category of secondary Vedic literature are the Anukramanis.  Anukramani can be translated as a catalogue or index, but it is actually an additional explanatory text, providing details about various aspects of the Vedic samhitas. Anukramanis are assigned to various authors, and several Rig Veda anukramanis are said to be written by Shaunaka, a rishi known from other sources too. These provide the names of deities, metres, rishi authors, and other details of the Rig Veda suktas [hymns]. Anukramanis are also commented on by other authors. For the Sama Veda, some of the Sama Veda Brahmanas have characteristics of Anukramanis, while the there are other Anukramanis too for this, as well as for the Yajur Veda and Atharva Veda.