An additional six chapters appear interspersed in Esther in the Septuagint, the Greek translation, which then was noted by Jerome in compiling the Latin Vulgate; additionally, the Greek text contains many small changes in the meaning of the main text. The extra chapters include several prayers to God, perhaps because it was felt that the above-mentioned lack of mention of God was inappropriate in a holy book. Jerome recognized them as additions not present in the Hebrew Text and placed them at the end of his Latin translation as chapters 10:4-16:24. However, some modern Catholic English Bibles restore the Septuagint order, such as Esther in the NAB. (Summary by Wikipedia)