Completed operations
Liability for injury or damage that shows up after a contractor's work is finished, such as a leak or a collapse months after turnover. For an additional insured, it usually needs its own endorsement.
CG 20 37On the certificate
It rarely appears at all. The products-completed operations aggregate sits in the general liability limits, which says nothing about whether you are covered as an additional insured after completion.
What to check
That a completed operations additional insured endorsement, such as CG 20 37, is attached, and how many years after completion your contract requires it to stay in force.
The common gap
Ongoing operations coverage only. The project ends, the claim arrives later and the additional insured status ended with the work.
Go deeper on forsured.ai: Does additional insured status cover you after the job is done?
Related: Additional insured · Certificate of insurance · Try Spot the Gap
General information, not legal or insurance advice. Ask your broker what your policies actually carry.