As was the case with "Shoku-Nihongi," short biographies called koden were added to the obituaries of the emperors and retainers of the Imperial Court, which was the same approach seen in the subsequent history books.
天皇・廷臣の死亡記事に短い伝記（薨伝）を付けたことは『続日本紀』にならい、後続の史書と同じである。