《北史·列传·卷四十四》
杨忄音的家传原来有 有魏以来，一门而已 ，这时，去掉了这八个字。
杨愔家传本云 有魏以来，一门而已 ，至是改此八字。
The family tradition of the Yang family originally had the phrase "since the beginning of the Wei dynasty, only one family". At this time, these eight words were removed.