diff --git a/data/refdata/exchanges.cfg b/data/refdata/exchanges.cfg
index c756b10..91d60b3 100644
--- a/data/refdata/exchanges.cfg
+++ b/data/refdata/exchanges.cfg
@@ -11,10 +11,11 @@
         # , "quote_asset":        "USD"
 
         # Environment setting example
+        # ------------------------------------
         # SIM_ORDER_ENTRY_WS_PORT=28081
         # SIM_ORDER_ENTRY_REST_PORT=28082
         # SIM_ACCOUNTING_REST_PORT=28083
-        # SIM_HOST=rt_simulator  # for *
+        # SIM_HOST=rt_simulator  # for **docker compose** service rt_simulator
 
         "mktdata" : {
             #