Sixty tiny fragments were pieced together over a period of a year, identifying the name of a festival marking the changes between seasons.
It also revealed a second scribe corrected mistakes made by the author.
The 900 scrolls, written by an ancient Jewish sect, have been a source of fascination since the first were discovered in a cave in Qumran in 1947.
The collection is considered the oldest copy of the Bible ever found, dating to at least the 4th Century BC.
