diff --git a/tutorial-04/testLibrary.sol b/tutorial-04/testLibrary.sol
index 96208d1..a4074e8 100644
--- a/tutorial-04/testLibrary.sol
+++ b/tutorial-04/testLibrary.sol
@@ -1,6 +1,6 @@
 pragma solidity ^0.4.0;
 
-import "browser/library.sol";
+import "./library.sol";
 
 contract TestLibrary {
     using IntExtended for uint;
diff --git a/tutorial-07/TestStrings.sol b/tutorial-07/TestStrings.sol
index f290c9e..5fb8a97 100644
--- a/tutorial-07/TestStrings.sol
+++ b/tutorial-07/TestStrings.sol
@@ -1,6 +1,6 @@
 pragma solidity ^0.4.0;
 
-import "browser/Strings.sol";
+import "./Strings.sol";
 
 contract TestStrings {
     
diff --git a/tutorial-09/MyToken.sol b/tutorial-09/MyToken.sol
index 635e9d3..8262699 100644
--- a/tutorial-09/MyToken.sol
+++ b/tutorial-09/MyToken.sol
@@ -1,6 +1,6 @@
 pragma solidity ^0.4.0;
 
-import "browser/ERC20.sol";
+import "./ERC20.sol";
 
 contract MyFirstToken is ERC20 {
     string public constant symbol = "MFT";
@@ -37,10 +37,13 @@ contract MyFirstToken is ERC20 {
             _value > 0 &&
             __allowances[_from][msg.sender] >= _value && 
             __balanceOf[_from] >= _value) {
-            __balanceOf[_from] -= _value;
-            __balanceOf[_to] += _value;
+
             // Missed from the video
+            // Allowances are updated first to prevent the re-entrancy exploit
             __allowances[_from][msg.sender] -= _value;
+
+            __balanceOf[_from] -= _value;
+            __balanceOf[_to] += _value;
             return true;
         }
         return false;
@@ -51,7 +54,7 @@ contract MyFirstToken is ERC20 {
         return true;
     }
     
-    function allowance(address _owner, address _spender) public constant returns (uint remaining) {
+    function allowance(address _owner, address _spender) public constant returns (uint availableAllowance) {
         return __allowances[_owner][_spender];
     }
 }
diff --git a/tutorial-10/MyFirstToken.sol b/tutorial-10/MyFirstToken.sol
index 36321be..15e2895 100644
--- a/tutorial-10/MyFirstToken.sol
+++ b/tutorial-10/MyFirstToken.sol
@@ -1,9 +1,9 @@
 pragma solidity ^0.4.0;
 
-import "browser/Token.sol";
-import "browser/ERC20.sol";
-import "browser/ERC223.sol";
-import "browser/ERC223ReceivingContract.sol";
+import "./Token.sol";
+import "./ERC20.sol";
+import "./ERC223.sol";
+import "./ERC223ReceivingContract.sol";
 
 contract MyFirstToken is Token("MFT", "My First Token", 18, 1000), ERC20, ERC223 {