diff --git a/MainSale.sol b/MainSale.sol
index 74065f4..753b562 100644
--- a/MainSale.sol
+++ b/MainSale.sol
@@ -12,9 +12,9 @@ library SafeMath {
   }
 
   function div(uint256 a, uint256 b) internal constant returns (uint256) {
-    // assert(b > 0); // Solidity automatically throws when dividing by 0
+    assert(b > 0); // Solidity automatically throws when dividing by 0
     uint256 c = a / b;
-    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
+    assert(a == b * c + a % b); // There is no case in which this doesn't hold
     return c;
   }