diff --git a/src/interfaces/IORMP.sol b/src/interfaces/IORMP.sol
index 972efac..79c76af 100644
--- a/src/interfaces/IORMP.sol
+++ b/src/interfaces/IORMP.sol
@@ -40,10 +40,11 @@ interface IORMP {
 
     /// @notice Get a quote in source native gas, for the amount that send() requires to pay for message delivery.
     /// @param toChainId The Message destination chain id.
-    //  @param to User application contract address which receive the message.
+    //  @param ua User application contract address which send the message.
+    /// @param gasLimit Gas limit for UA used.
     /// @param encoded The calldata which encoded by ABI Encoding.
     /// @param params General extensibility for relayer to custom functionality.
-    function fee(uint256 toChainId, address to, bytes calldata encoded, bytes calldata params)
+    function fee(uint256 toChainId, address ua, uint256 gasLimit, bytes calldata encoded, bytes calldata params)
         external
         view
         returns (uint256);