diff --git a/freqtrade/data/btanalysis.py b/freqtrade/data/btanalysis.py
index 6911941e6..5f5ced053 100644
--- a/freqtrade/data/btanalysis.py
+++ b/freqtrade/data/btanalysis.py
@@ -446,7 +446,8 @@ def _calc_drawdown_series(profit_results: pd.DataFrame, *, date_col: str, value_
         max_balance = starting_balance + max_drawdown_df['high_value']
         max_drawdown_df['drawdown_relative'] = ((max_balance - cumulative_balance) / max_balance)
     else:
-        # This is not completely accurate
+        # NOTE: This is not completely accurate,
+        # but might good enough if starting_balance is not available
         max_drawdown_df['drawdown_relative'] = (
             (max_drawdown_df['high_value'] - max_drawdown_df['cumulative'])
             / max_drawdown_df['high_value'])