Testing formatting questions

[BoomerProf]

 onlyOwner {
        // require(msg.sender == i_owner, "Sender is not owner");
        if(msg.sender != i_owner){
            revert NotOwner();
        }
        _;
    }

Why do I get the following error?

ParserError: Expected identifier but got '{'
--> FindMe.sol:54:15:
|
54 | onlyOwner {
| ^

What's going on here??

[gmluqa]

    modifier onlyOwner {
        if (msg.sender != i_owner) {revert NotOwner();}
        _;
    }
}

It needs the modifier keyword!

[BoomerProf]

Thanks!!!