diff --git a/contracts/OffsetHelper.sol b/contracts/OffsetHelper.sol
index 984217d..68d03d6 100644
--- a/contracts/OffsetHelper.sol
+++ b/contracts/OffsetHelper.sol
@@ -17,7 +17,7 @@ import "./interfaces/IToucanContractRegistry.sol";
  *
  * Retiring carbon tokens requires multiple steps and interactions with
  * Toucan Protocol's main contracts:
- * 1. Obtain a Toucan pool token e.g., NCT (by performing a token
+ * 1. Obtain a pool token e.g., NCT (by performing a token
  *    swap on a DEX).
  * 2. Redeem the pool token for a TCO2 token.
  * 3. Retire the TCO2 token.
@@ -359,7 +359,7 @@ contract OffsetHelper is OffsetHelperStorage {
         IToucanPoolToken PoolTokenImplementation = IToucanPoolToken(_fromToken);
 
         // auto redeem pool token for TCO2; will transfer automatically picked TCO2 to this contract
-        (tco2s, amounts) = PoolTokenImplementation.redeemAuto2(_amount);
+        (tco2s, amounts) = PoolTokenImplementation.redeemAuto(_amount);
 
         // update balances
         balances[msg.sender][_fromToken] -= _amount;
diff --git a/contracts/interfaces/IToucanPoolToken.sol b/contracts/interfaces/IToucanPoolToken.sol
index 25672ed..b0c2d5c 100644
--- a/contracts/interfaces/IToucanPoolToken.sol
+++ b/contracts/interfaces/IToucanPoolToken.sol
@@ -12,24 +12,27 @@ interface IToucanPoolToken is IERC20Upgradeable {
 
     function checkEligible(address erc20Addr) external view returns (bool);
 
-    function checkAttributeMatching(address erc20Addr)
-        external
-        view
-        returns (bool);
+    function checkAttributeMatching(
+        address erc20Addr
+    ) external view returns (bool);
 
     function calculateRedeemFees(
         address[] memory tco2s,
         uint256[] memory amounts
     ) external view returns (uint256);
 
-    function redeemMany(address[] memory tco2s, uint256[] memory amounts)
-        external;
+    function redeemMany(
+        address[] memory tco2s,
+        uint256[] memory amounts
+    ) external;
 
-    function redeemAuto(uint256 amount) external;
+    function redeemAuto(
+        uint256 amount
+    ) external returns (address[] memory tco2s, uint256[] memory amounts);
 
-    function redeemAuto2(uint256 amount)
-        external
-        returns (address[] memory tco2s, uint256[] memory amounts);
+    function redeemAuto2(
+        uint256 amount
+    ) external returns (address[] memory tco2s, uint256[] memory amounts);
 
     function getRemaining() external view returns (uint256);