成唯識論述記 3.475

3.475

述曰：念相明記曾習事轉，此識昧而且劣，恒緣任運現在之境，不能明記曾所受境，故無有念。

The Commentary states: The characteristic of smṛti operates by clearly recalling previously experienced things; this consciousness is dim and inferior, constantly taking as an object a spontaneous, present object, unable to clearly recall previously experienced objects, hence it lacks smṛti.