diff --git a/freqtrade/persistence/trade_model.py b/freqtrade/persistence/trade_model.py
index 51520fa32..856a33abf 100644
--- a/freqtrade/persistence/trade_model.py
+++ b/freqtrade/persistence/trade_model.py
@@ -558,6 +558,11 @@ class LocalTrade:
         )
 
     def to_json(self, minified: bool = False) -> Dict[str, Any]:
+        """
+        :param minified: If True, only return a subset of the data is returned.
+                         Only used for backtesting.
+        :return: Dictionary with trade data
+        """
         filled_or_open_orders = self.select_filled_or_open_orders()
         orders_json = [order.to_json(self.entry_side, minified) for order in filled_or_open_orders]