diff --git a/src/app/api/core/markets.py b/src/app/api/core/markets.py
index a1b1b79..e330c58 100644
--- a/src/app/api/core/markets.py
+++ b/src/app/api/core/markets.py
@@ -23,7 +23,7 @@ class ProductInfo(BaseModel):
             products (dict[str, list[ProductInfo]]): Map provider -> list of ProductInfo
             filter_currency (str): If set, only products with this currency are considered. Defaults to "USD".
         Returns:
-            dict[ProductInfo, str]: Map of aggregated ProductInfo by symbol
+            list[ProductInfo]: List of ProductInfo aggregated by symbol
         """
 
         # Costruzione mappa id -> lista di ProductInfo + lista di provider
diff --git a/tests/utils/test_market_aggregator.py b/tests/utils/test_market_aggregator.py
index 087711a..3befe78 100644
--- a/tests/utils/test_market_aggregator.py
+++ b/tests/utils/test_market_aggregator.py
@@ -33,7 +33,6 @@ class TestMarketDataAggregator:
             "Provider3": [self.__product("BTC", 49900.0, 900.0, "USD")],
         }
 
-        # aggregate_single_asset returns a single ProductInfo, not a list
         aggregated = ProductInfo.aggregate(products)
         assert len(aggregated) == 1