diff --git a/data/refdata/exchanges.cfg b/data/refdata/exchanges.cfg
index b5cca38..93c78f3 100644
--- a/data/refdata/exchanges.cfg
+++ b/data/refdata/exchanges.cfg
@@ -336,16 +336,17 @@
             }
         }
         , "instruments": {
+            # dynamically created instruments (futures)
             "credentials_key": "COINBASE_ADV_RO"
             "class": "cvttpy_trading.exchanges.coinbase.spot.market.InstrumentLoader"
             , "api": {
                 "REST": {
                     "products_method": "GET"
-                    "products_url": "https://api.coinbase.com/api/v3/brokerage/products"
-                    "futures_params": {
-                        "product_type": "FUTURE",
-                        "contract_expiry_type": "EXPIRING",
-                        "expiring_contract_status": "STATUS_UNEXPIRED"
+                    , "products_url": "https://api.coinbase.com/api/v3/brokerage/products"
+                    , "futures_params": {
+                        "product_type": "FUTURE"
+                        , "contract_expiry_type": "EXPIRING"
+                        , "expiring_contract_status": "STATUS_UNEXPIRED"
                     }
                 }
             }