A Commentary on the Vinaya Pitaka written by Buddhaghosa Thera (Gv.59).
It was written at the request of Buddhasiri and was based on the Mahāpaccariya and the Kurundī Atthakathā.
See also Sāratthadīpanī. Sp.i.2.; the reason for the name is given at Sp.i.201.