diff --git a/package.json b/package.json
index b1fbc7e..68f0b97 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hop.ag/sdk",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "Official Hop SDK to access Hop Aggregator",
   "type": "module",
   "main": "dist/cjs/index.js",
diff --git a/readme.md b/readme.md
index f3878b9..f3daa00 100644
--- a/readme.md
+++ b/readme.md
@@ -13,8 +13,13 @@ import { getFullnodeUrl } from "@mysten/sui/client";
 const rpc_url = getFullNodeUrl("mainnet");
 const hop_api_options: HopApiOptions = {
   api_key: "",
+  
+  // 1bps = 0.01%. 10_000bps = 100%.
   fee_bps: 0,
   fee_wallet: "YOUR_SUI_ADDRESS_HERE",
+  
+  // option to charge fees in sui when possible
+  // instead of only the output token
   charge_fees_in_sui: true,
 };