diff --git a/custom_components/saj_modbus/config_flow.py b/custom_components/saj_modbus/config_flow.py
index a8dac04..3c83a56 100644
--- a/custom_components/saj_modbus/config_flow.py
+++ b/custom_components/saj_modbus/config_flow.py
@@ -1,3 +1,5 @@
+"""Config flow for SAJ R5 Inverter Modbus."""
+
 import ipaddress
 import re
 
diff --git a/custom_components/saj_modbus/hub.py b/custom_components/saj_modbus/hub.py
index 513c16f..af2942f 100644
--- a/custom_components/saj_modbus/hub.py
+++ b/custom_components/saj_modbus/hub.py
@@ -1,4 +1,4 @@
-"""SAJ Modbus Hub"""
+"""SAJ Modbus Hub."""
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 from voluptuous.validators import Number
 import logging
diff --git a/custom_components/saj_modbus/sensor.py b/custom_components/saj_modbus/sensor.py
index 8622230..1a559cb 100644
--- a/custom_components/saj_modbus/sensor.py
+++ b/custom_components/saj_modbus/sensor.py
@@ -1,3 +1,5 @@
+"""Sensor Platform Device for SAJ R5 Inverter Modbus."""
+
 from __future__ import annotations
 from datetime import datetime
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
@@ -98,4 +100,6 @@ def native_value(self):
         # the values returned by the inverter are not reliable.
         if self.coordinator.data.get("mpvmode") in (1, 2):  # "Waiting" or "Normal"
             return self.coordinator.data.get(self.entity_description.key)
-        return None
\ No newline at end of file
+        return None
+
+
diff --git a/custom_components/saj_modbus/services.py b/custom_components/saj_modbus/services.py
index 09bd748..1f16e39 100644
--- a/custom_components/saj_modbus/services.py
+++ b/custom_components/saj_modbus/services.py
@@ -69,4 +69,5 @@ async def async_set_date_time(hass: HomeAssistant, data: Mapping[str, Any]) -> N
     await hass.async_add_executor_job(
         hub.set_date_and_time,
         data.get(ATTR_DATETIME, None)
-    )
\ No newline at end of file
+    )
+