The Pali Text Society’s editions of the Petavatthu and the Vimānavatthu commentaries have been out of print for some years. These editions first published in 1894 and 1901 respectively were considered too flawed to keep in print. Peter Jackson has prepared a new edition of the Petavatthu commentary (Paramatthadīpanī IV) using the Burmese Sixth Council edition and collating variant readings from the original PTS edition by E. Hardy (1894), the Sinhala-script edition published as part of the Simon Hewavitarne Bequest Series, and the BUDSIR electronic text (apparently based on the Thai-script Mahācuḷālaṅkaraṇarājavidyālaya edition). Variant readings found in the notes of all these editions are also included. Page breaks and the line breaks of the Hardy edition are kept as far as possible to facilitate finding references to page and line numbers. A complete word index prepared by Professor Yumi Ousaka is also included.