Small doc changes

freqtrade/strategy/interface.py

@@ -290,6 +290,7 @@ class IStrategy(ABC, HyperStrategyMixin):
         :param current_time: datetime object, containing the current datetime
         :param current_rate: Rate, calculated based on pricing settings in ask_strategy.
         :param current_profit: Current profit (as ratio), calculated based on current_rate.
+        :param dataframe: Analyzed dataframe for this pair. Can contain future data in backtesting.
         :param **kwargs: Ensure to keep this here so updates to this won't break your strategy.
         :return float: New stoploss value, relative to the currentrate
         """