Clarify the meaning of "Primers"

[dcwalk]

I think we've overloaded the term "Primers" and I'm not sure the context of use here:
https://alpha.archivers.space/primers

Also, the description doesn't seem (I'm probably missing something) to reflect the use:
"In order to make our archiving efforts as thorough and systematic as possible, we use Agency Archiving Primers to identify key programs, datasets, and documents that are vulnerable to change and loss. Primers are composed of sources, which each specify a url as a starting point for archiving."

We just get a paragraph description of the agency but there isn't a complete listing of sub-offices or identification of vulnerable data