    /**
        @notice sets Fee (in basis points eg. 100 bps = 1%) for instant unstaking
        @param _fee uint - fee in basis points
     */
    function setFee(uint256 _fee) external onlyOwner {
        // check range before setting fee
        require(_fee <= BASIS_POINTS, "Out of range");
        fee = _fee;

        emit FeeChanged(_fee);
    }
