diff --git a/data/refdata/exchanges.cfg b/data/refdata/exchanges.cfg
index 8588380..188b3c4 100644
--- a/data/refdata/exchanges.cfg
+++ b/data/refdata/exchanges.cfg
@@ -4,11 +4,17 @@
     "__DUMMY__": {}
     # ----------------------------- A
     , "__TRADING_SIMULATOR__": {
+        #  ------ VALUES TO BE REPLACED 
         # "exchange_id":          "COINBASE"
         # , "name":               "Coinbase AT (Simulated)"
         # , "type":               "SPOT"
         # , "quote_asset":        "USD"
 
+        # Environment setting example
+        # SIM_ORDER_ENTRY_WS_PORT=28081
+        # SIM_ORDER_ENTRY_REST_PORT=28082
+        # SIM_ACCOUNTING_REST_PORT=28083
+
         "mktdata" : {
             # 
             "class":  "cvttpy_trading.exchanges.mkt_simulator.md_client.MktSimMdClientFeed"