diff --git a/src/mash/bridges/fritzbox.py b/src/mash/bridges/fritzbox.py
index 89a10d4..9370a29 100644
--- a/src/mash/bridges/fritzbox.py
+++ b/src/mash/bridges/fritzbox.py
@@ -10,7 +10,14 @@ EXCEPTION_RECONNECT_TIMEOUT_SEC = 60
 
 
 class FritzDeviceState:
+    """Holds the state of a fritzbox device and implements comparisons."""
+
     def __init__(self, mac_address: str, raw_state: dict) -> None:
+        """
+        Args:
+            mac_address (str): Mac Address of fritzbox device.
+            raw_state (dict): Raw device state containing NewActive, NewIPAddress, NewAddressSource, NewLeaseTimeRemaining, NewInterfaceType & NewHostName.
+        """
         logging.debug(
             f"Fritz raw device state to mac [{mac_address}]: {raw_state}",
             extra=raw_state,
@@ -48,6 +55,13 @@ class FritzBoxBridge(Bridge):
         port: Optional[int] = None,
         refresh_delay_sec: int = 60,
     ) -> None:
+        """
+        Args:
+            id (str): Id of fritzbox bridge.
+            ip (str): IP Address of fritzbox bridge in network to connect to.
+            port (Optional[int], optional): Port of fritzbox bridge in network to connect to. Defaults to None.
+            refresh_delay_sec (int, optional): Delay between pull cycles to get recent states from fritzbox in seconds. Defaults to 60.
+        """
         super().__init__(id=id, type="fritzbox")
         self._ip = ip
         self._port = port