In addition, writing a diary on the blank space of guchureki (annotated calendar) had been practiced since the Nara period and when more space was needed, extra lines were added on the back side of the calendar.
また、奈良時代から具注暦の余白部分に日記を書く習慣が生まれたが、書ききれなかった部分を紙背に追記して記述した。