diff --git a/freqtrade/data/converter/orderflow.py b/freqtrade/data/converter/orderflow.py
index b460bea59..e94502211 100644
--- a/freqtrade/data/converter/orderflow.py
+++ b/freqtrade/data/converter/orderflow.py
@@ -191,6 +191,7 @@ def populate_dataframe_with_trades(
         logger.debug(f"trades.groups_keys in {time.time() - start_time} seconds")
 
         # Merge the complex data Series back into the DataFrame
+        # TODO: maybe candle_start and candle_end should be dropped before assignment?
         dataframe["trades"] = trades_series
         dataframe["orderflow"] = orderflow_series
         dataframe["imbalances"] = imbalances_series