diff --git a/contracts/HubPool.sol b/contracts/HubPool.sol
index 891a6bc4f..d2a8df3a1 100644
--- a/contracts/HubPool.sol
+++ b/contracts/HubPool.sol
@@ -808,8 +808,12 @@ contract HubPool is HubPoolInterface, Testable, Lockable, MultiCaller, Ownable {
     }
 
     /**
-     * @notice This function allows a caller to load the contract with raw ETH to perform L2 calls. This is needed for arbitrum
-     * calls, but may also be needed for others.
+     * @notice This function allows a caller to load the contract with raw ETH to perform L2 calls. This is needed for
+     * Arbitrum calls, but may also be needed for others.
+     * @dev This function cannot be included in a multicall transaction call because it is payable. A realistic
+     * situation where this might be an issue is if the caller is executing a PoolRebalanceLeaf that needs to relay
+     * messages to Arbitrum. Relaying messages to Arbitrum requires that this contract has an ETH balance, so in this
+     * case the caller would need to pre-load this contract with ETH before multicall-executing the leaf.
      */
     function loadEthForL2Calls() public payable override {}