diff --git a/freqtrade/data/history/hdf5datahandler.py b/freqtrade/data/history/hdf5datahandler.py
index dadc9c7e6..1aa7f2883 100644
--- a/freqtrade/data/history/hdf5datahandler.py
+++ b/freqtrade/data/history/hdf5datahandler.py
@@ -28,7 +28,7 @@ class HDF5DataHandler(IDataHandler):
         Returns a list of all pairs with ohlcv data available in this datadir
         :param datadir: Directory to search for ohlcv files
         :param trading_mode: trading-mode to be used
-        :return: List of Tuples of (pair, timeframe)
+        :return: List of Tuples of (pair, timeframe, CandleType)
         """
         if trading_mode == TradingMode.FUTURES:
             datadir = datadir.joinpath('futures')
diff --git a/freqtrade/data/history/idatahandler.py b/freqtrade/data/history/idatahandler.py
index 07dc7c763..17ee0918e 100644
--- a/freqtrade/data/history/idatahandler.py
+++ b/freqtrade/data/history/idatahandler.py
@@ -46,7 +46,7 @@ class IDataHandler(ABC):
         Returns a list of all pairs with ohlcv data available in this datadir
         :param datadir: Directory to search for ohlcv files
         :param trading_mode: trading-mode to be used
-        :return: List of Tuples of (pair, timeframe)
+        :return: List of Tuples of (pair, timeframe, CandleType)
         """
 
     @classmethod
diff --git a/freqtrade/data/history/jsondatahandler.py b/freqtrade/data/history/jsondatahandler.py
index 83ec183df..c000cd15e 100644
--- a/freqtrade/data/history/jsondatahandler.py
+++ b/freqtrade/data/history/jsondatahandler.py
@@ -30,7 +30,7 @@ class JsonDataHandler(IDataHandler):
         Returns a list of all pairs with ohlcv data available in this datadir
         :param datadir: Directory to search for ohlcv files
         :param trading_mode: trading-mode to be used
-        :return: List of Tuples of (pair, timeframe)
+        :return: List of Tuples of (pair, timeframe, CandleType)
         """
         if trading_mode == 'futures':
             datadir = datadir.joinpath('futures')