    function changeTokenInfo(uint16 tokenCode, address tokenContract) external onlyRegistryOwner() {
        require (tokenCode != 0,
                 "Token code of zero is reserved for Ether.");
        require (tokenContracts[tokenCode] == address(0),
                 "Token contract address can be assigned only once.");
        tokenContracts[tokenCode] = tokenContract;
        emit ChangeTokenInfo(tokenCode, tokenContract);
    }