$patch remove keyword from required

I saw in the tests how to add an attribute to the required keyword { "op": "add", "path": "/required/-", "value": "q" }
but I want to ask how can i remove a keyword from being required I tried
{ "op": "remove", "path": "/required/-q"} but it did not work i seem to get it wrong so if anyone can help I would be grateful.
Thank you