diff --git a/data_processor.py b/data_processor.py
index 167a040..ed20f96 100644
--- a/data_processor.py
+++ b/data_processor.py
@@ -14,6 +14,7 @@
 RE_RETRIEVE_RATIO = 0.8  # 80% of cumulated energy sent to the grid
 CONFIG_FILE_PATH = "config.yml"
 
+
 # From python3.11 'StrEnum' can be used
 class DataTypes(str, Enum):
     """Energy types"""
diff --git a/table_view.py b/table_view.py
index ca36898..b446b90 100644
--- a/table_view.py
+++ b/table_view.py
@@ -32,7 +32,7 @@ def __str__(self) -> str:
 
 
 class TableView():
-    headers: list[str] = []
+    headers: list[tuple[str, str]] = []
     rows: list[list[Any]] = []
 
     def __init__(self, col_width: int = 8) -> None: