The text, like all Puranas, has likely gone through revisions, additions and interpolations over its history. Rajendra Hazra, as well as other scholars, for example, consider "Gaya-mahatmya", which is an embedded travel guide to Gaya, as a later addition. The "Gaya-mahatmya" replaced older sections of the "Vayu Purana", sometime before the 15th century. Vayu Purana, like all Puranas, has a complicated chronology. Dimmitt and van Buitenen state that each of the Puranas is encyclopedic in style, and it is difficult to ascertain when, where, why and by whom these were written: