俱舍論記 4.124

4.124

「若於無記至應知如前釋」者，此即第四於五品中明有覆無記心所俱生。能有覆障、或有癡覆，故名有覆。以過輕故，無勝用記、不能感果，故名無記。

"If in the indeterminate [...] should be known as explained before": this is the fourth [section], explaining the co-arising of mental factors in the obscured-indeterminate (nivṛtāvyākṛta) among the five categories. Because it can obscure and obstruct, or because there is obscuration by delusion (moha), it is called "obscured." Because its fault is light, lacking predominant function to be designated, and unable to project a retribution, it is called "indeterminate" (avyākṛta).