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contracts: add comment on approve of EIP20 #14

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contracts: add comment on approve of EIP20 #14

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4 changes: 4 additions & 0 deletions contracts/ERC20Token.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -99,6 +99,10 @@ contract ERC20Token is ERC20Interface, Owned {
}


/*
* Note that when changing the approved allowance for a spender the sender should
* first check that the allowance for the spender is zero.
*/
function approve(address _spender, uint256 _value) public returns (bool success) {

allowed[msg.sender][_spender] = _value;
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