From the document: This document corrects and clarifies some text in the fifth edition Dungeon Master's Guide. Recent printings of the book, starting with the third, include these changes. User summary: These errata are formally published by Wizards of the Coast as official updates and changes to the rules contained in the Dungeon Master's Guide. Generally, the printing of the Dungeon Master's Guide subsequent to the errata will include the changes provided in the errata. These incorporated changes are cumulative.