should the security manual mention the meta-exein layer?

  looking at this section in the security manual:

https://docs.yoctoproject.org/security-manual/securing-images.html#tools-for-hardening-your-image

and it's awfully brief, simply referring the reader to the
comprehensive meta-security layer. but can/should that section be
extended to include other (possibly non-YP) layers?

  for example, here:

https://docs.yoctoproject.org/ref-manual/yocto-project-supported-features.html#primary-supported

the meta-exein layer is listed as "Primary Supported", so does that
mean it merits at least a mention? what about other YP-compatible
tools?

rday