```\nfunction addTokenPriceFeed(address token, address feed) external onlyOwner {\n  if (token == address(0)) revert Errors.ZeroAddressNotAllowed();\n  if (feed == address(0)) revert Errors.ZeroAddressNotAllowed();\n  if (feeds[token] != address(0)) revert Errors.TokenPriceFeedAlreadySet();\n\n  feeds[token] = feed;\n}\n```\n