diff --git a/pymchelper/input_output.py b/pymchelper/input_output.py
index 4fcbdf55..71fd043f 100644
--- a/pymchelper/input_output.py
+++ b/pymchelper/input_output.py
@@ -97,7 +97,6 @@ def fromfilelist(input_file_list,
     :param nan: if True, NaN (not a number) are excluded when averaging data.
     :return: list of estimators
     """
-
     if not isinstance(input_file_list, list):  # probably a string instead of list
         input_file_list = [input_file_list]