diff --git a/src/contracts/core/DelegationManager.sol b/src/contracts/core/DelegationManager.sol
index ff779c48a..e47df8135 100644
--- a/src/contracts/core/DelegationManager.sol
+++ b/src/contracts/core/DelegationManager.sol
@@ -745,7 +745,6 @@ contract DelegationManager is
      */
 
     /**
-     *
      * @notice helper to calculate the new depositScalingFactor after adding shares. This is only used
      * when a staker is depositing through the StrategyManager or EigenPodManager. A staker's depositScalingFactor
      * is only updated when they have new deposits and their shares are being increased.
@@ -756,7 +755,7 @@ contract DelegationManager is
         uint64 totalMagnitude,
         Shares existingShares,
         OwnedShares addedOwnedShares
-    ) internal returns (uint256 newDepositScalingFactor) {
+    ) internal {
         uint256 newDepositScalingFactor;
         if (existingShares.unwrap() == 0) {
             newDepositScalingFactor = WAD / totalMagnitude;
diff --git a/src/contracts/interfaces/IDelegationManager.sol b/src/contracts/interfaces/IDelegationManager.sol
index 6e2596a4e..18f79d561 100644
--- a/src/contracts/interfaces/IDelegationManager.sol
+++ b/src/contracts/interfaces/IDelegationManager.sol
@@ -341,18 +341,18 @@ interface IDelegationManager is ISignatureUtils {
 
     /**
      * @notice Decreases a native restaker's delegated share balance in a strategy due to beacon chain slashing. This updates their beaconChainScalingFactor.
-     * Their operator's scaled shares are also updated (if they are delegated).
-     * @param staker The address to increase the delegated scaled shares for their operator.
-     * @param shares The number of shares of beaconChainETHStrategy the staker has, not including scaling factors or
-     * @param proportionPodBalanceDecrease The proportion of the staker's shares to decrease. This is a fraction of the staker's shares in the strategy.
+     * Their operator's stakeShares are also updated (if they are delegated).
+     * @param staker The address to increase the delegated stakeShares for their operator.
+     * @param existingShares The number of shares the staker already has in the EPM. This does not change upon decreasing shares.
+     * @param proportionOfOldBalance The current pod owner shares proportion of the previous pod owner shares
      *
-     * @dev *If the staker is actively delegated*, then decreases the `staker`'s delegated scaled shares in `strategy` by `scaledShares`. Otherwise does nothing.
+     * @dev *If the staker is actively delegated*, then decreases the `staker`'s delegated stakeShares in `strategy` by `proportionPodBalanceDecrease` proportion. Otherwise does nothing.
      * @dev Callable only by the EigenPodManager.
      */
     function decreaseBeaconChainScalingFactor(
         address staker,
-        Shares shares,
-        uint64 proportionPodBalanceDecrease
+        Shares existingShares,
+        uint64 proportionOfOldBalance
     ) external;
 
     /**
diff --git a/src/contracts/interfaces/IEigenPod.sol b/src/contracts/interfaces/IEigenPod.sol
index 33fd4ed61..113e91177 100644
--- a/src/contracts/interfaces/IEigenPod.sol
+++ b/src/contracts/interfaces/IEigenPod.sol
@@ -13,8 +13,12 @@ import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
  *   to account balances in terms of gwei in the EigenPod contract and convert to wei when making calls to other contracts
  */
 interface IEigenPod {
-    /// @dev Thrown when msg.sender is not allowed to call a function
-    error UnauthorizedCaller();
+    /// @dev Thrown when msg.sender is not the EPM.
+    error OnlyEigenPodManager();
+    /// @dev Thrown when msg.sender is not the pod owner.
+    error OnlyEigenPodOwner();
+    /// @dev Thrown when msg.sender is not owner or the proof submitter.
+    error OnlyEigenPodOwnerOrProofSubmitter();
     /// @dev Thrown when attempting an action that is currently paused.
     error CurrentlyPaused();