diff --git a/freqtrade/exchange/__init__.py b/freqtrade/exchange/__init__.py
index d05436a36..c53858076 100644
--- a/freqtrade/exchange/__init__.py
+++ b/freqtrade/exchange/__init__.py
@@ -159,7 +159,6 @@ class Exchange(object):
         return self._api.id
 
     def klines(self, pair_interval: Tuple[str, str], copy=True) -> DataFrame:
-        # create key tuple
         if pair_interval in self._klines:
             return self._klines[pair_interval].copy() if copy else self._klines[pair_interval]
         else: