diff --git a/src/interfaces/IMorpho.sol b/src/interfaces/IMorpho.sol
index 9f1f81f5a..69a02544a 100644
--- a/src/interfaces/IMorpho.sol
+++ b/src/interfaces/IMorpho.sol
@@ -84,6 +84,8 @@ interface IMorpho {
     function nonce(address authorizer) external view returns (uint256);
 
     /// @notice The market params corresponding to `id`.
+    /// @dev This mapping is not used in Morpho. It is there to enable reducing the cost associated to calldata on layer
+    /// 2s by creating a wrapper contract with functions that take `id` as input instead of `marketParams`.
     function idToMarketParams(Id id)
         external
         view