diff --git a/onchain/script/DeployBaseMainnet.sol b/onchain/script/DeployBaseMainnet.sol
index eaa5a46..8fce9e0 100644
--- a/onchain/script/DeployBaseMainnet.sol
+++ b/onchain/script/DeployBaseMainnet.sol
@@ -12,6 +12,17 @@ import { DeployBase } from "./DeployBase.sol";
 contract DeployBaseMainnet is DeployBase {
     constructor() {
         // Base mainnet configuration
+        //
+        // feeDest — production fee-destination (a team-controlled contract on Base mainnet).
+        // This address has contract bytecode on Base mainnet, so
+        // LiquidityManager.setFeeDestination() will set feeDestinationLocked=true
+        // on the first call (see LiquidityManager.sol line 154). That is the
+        // intended production path — once set to a contract, changes are locked.
+        //
+        // NOTE: FitnessEvaluator.t.sol intentionally uses a *different* FEE_DEST
+        // (0x8A91...9383) because on a mainnet fork the locking behaviour breaks
+        // snapshot/revert test cycles.  The test address is NOT a production value.
+        // See FitnessEvaluator.t.sol:146-150 for the full rationale.
         feeDest = 0xf6a3eef9088A255c32b6aD2025f83E57291D9011;
 
         weth = 0x4200000000000000000000000000000000000006; // WETH on Base