diff --git a/en/16/07.md b/en/16/07.md
index 5aaa7d104b..1af984fa1d 100644
--- a/en/16/07.md
+++ b/en/16/07.md
@@ -24,6 +24,7 @@ material:
             address callerAddress;
             uint256 ethPrice;
           }
+          mapping (uint256=>Response[]) public requestIdToResponse;
           event GetLatestEthPriceEvent(address callerAddress, uint id);
           event SetLatestEthPriceEvent(uint256 ethPrice, address callerAddress);
           event AddOracleEvent(address oracleAddress);