From aad25205cdc54243ccfe82a1bd35c08904d2a152 Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Tue, 29 Aug 2017 11:50:02 -0300
Subject: [PATCH] add comment making explicit that SafeMath.sub can throw

---
 contracts/token/BasicToken.sol | 1 +
 1 file changed, 1 insertion(+)

diff --git a/contracts/token/BasicToken.sol b/contracts/token/BasicToken.sol
index e584df274..d13156477 100644
--- a/contracts/token/BasicToken.sol
+++ b/contracts/token/BasicToken.sol
@@ -22,6 +22,7 @@ contract BasicToken is ERC20Basic {
   function transfer(address _to, uint256 _value) returns (bool) {
     require(_to != address(0));
 
+    // SafeMath.sub will throw if there is not enough balance.
     balances[msg.sender] = balances[msg.sender].sub(_value);
     balances[_to] = balances[_to].add(_value);
     Transfer(msg.sender, _to, _value);