Export MYSQL to .CSV Add Column Names PHP

Here is my code to export my MySQL table to .csv. How do I add the column names to it ? Thanks

<?php
    // mysql database connection details
    $host = "localhost";
    $username = "";
    $password = "";
    $dbname = "";

    // open connection to mysql database
    $connection = mysqli_connect($host, $username, $password, $dbname) or die("Connection Error " . mysqli_error($connection));
    
    // fetch mysql table rows
    $sql = "select * from masterbrewlist";
    $result = mysqli_query($connection, $sql) or die("Selection Error " . mysqli_error($connection));

    $fp = fopen('masterlist.csv', 'w');

    while($row = mysqli_fetch_assoc($result))
    {
        fputcsv($fp, $row);
    }
    
    fclose($fp);

    //close the db connection
    mysqli_close($connection);
?>

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