diff --git a/mlair/plotting/data_insight_plotting.py b/mlair/plotting/data_insight_plotting.py
index da1448763e73b2c1c90a58e4bb46e11bc7142a97..2f75b16af44764f7b7823aee5f12b9149fd7008f 100644
--- a/mlair/plotting/data_insight_plotting.py
+++ b/mlair/plotting/data_insight_plotting.py
@@ -467,6 +467,7 @@ class PlotPeriodogram(AbstractPlotClass):  # pragma: no cover
         not compatible with any custom data handler. Proven data handlers are `DefaultDataHandler`,
         `DataHandlerMixedSampling`, `DataHandlerMixedSamplingWithFilter`. To work properly, the data handler must have
         the attribute `.id_class._data`.
+
     """
 
     def __init__(self, generator: Dict[str, DataCollection], plot_folder: str = ".", plot_name="periodogram",