The organization makes sure that the people it needs to run and keep up an effective FSMS are competent. Where outside experts help develop, implement, operate or assess the system, documented information is retained as evidence of the agreements or contracts that set out their competency, responsibility and authority.
This control maps to 22 controls across 3 other frameworks. If you already hold one of them, the evidence you collected for it is the starting point here rather than new work.