update docs

README.md

@@ -26,8 +26,13 @@ import { providers } from "ethers";
 const provider = new providers.Web3Provider(window.ethereum);
 const signer = provider.getSigner();
 
+// by default Masa SDK will assume the provider points to ethereum mainnet and
+// will load contracts accordingly. If you plan to connect to a different network
+// the networkName must be specified i.e. like this: networkName: "goerli"
+
 export const masa = new Masa({
   signer,
+  // networkName: "goerli",
 });
 ```
 
@@ -38,11 +43,15 @@ import { Masa } from "@masa-finance/masa-sdk";
 import { providers, Wallet } from "ethers";
 
 const provider = new providers.JsonRpcProvider("your blockchain rpc endpoint");
-
 const wallet = new Wallet("your private key", provider);
 
+// by default Masa SDK will assume the provider points to ethereum mainnet and
+// will load contracts accordingly. If you plan to connect to a different network
+// the networkName must be specified i.e. like this: networkName: "goerli"
+
 export const masa = new Masa({
   signer: wallet,
+  // networkName: "goerli",
 });
 ```