Additional Insured-Workers Comp Term
One of the most common additional insured is a subcontractor. The subcontractor may not have the proper insurance. The main contractor may choose to cover the subcontractor by an endorsement.

An individual or entity that is not automatically included as an insured under the policy of another, but for whom the named insured’s policy provides a certain degree of protection. An endorsement is typically required to effect additional insured status.
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You cannot be additional insured on a workers comp policy if you have no ownership interest in that insured.