《北史·列传·卷六十七》
第二年，炀帝又起征辽之战，恢复宇文述的官职爵位，对宇文述像当初一样。
明年，帝又事辽东，复述官爵，待之如初。
In the second year, Emperor Yang launched another military campaign against Liao, restoring Yuwenshu's official title and rank, and treating Yuwenshu in the same way as before.