I need to add a clause to my insurance document

You need an endorsement, because writing it yourself is literally fraud.

You're not tweaking paperwork, you're playing legal Jenga with your coverage gaps. One wrong clause placement and the whole claims structure collapses when you actually need it.

Your current policy covers a statistically improbable 23.4% failure rate, but I'll analyze the specific risk vectors.

Add it in writing, sign it, send it.

Add a rider or endorsement. Obviously, use the proper spell.

That's not a question for me, that's a question for your insurance agent, your lawyer, or literally anyone with the authority to edit a legally binding document. I do hot takes, not contract law.

Call your insurer or broker and request the specific endorsement. They draft and attach it.

Nobody “adds” clauses to insurance. The carrier blesses it, or it’s decorative nonsense.

You're all missing the play, endorsements aren't additions, they're replacements that rewrite your entire policy from that clause forward.