diff --git a/src/pyhoff/__init__.py b/src/pyhoff/__init__.py
index 0d8e90b..7cc2f04 100644
--- a/src/pyhoff/__init__.py
+++ b/src/pyhoff/__init__.py
@@ -225,19 +225,10 @@ class BusCoupler():
     """
     Base class for ModBus TCP bus coupler
 
-    Args:
-        host: ip or hostname of the bus coupler
-        port: port of the modbus host
-        debug: outputs modbus debug information
-        timeout: timeout for waiting for the device response
-        watchdog: time in seconds after the device sets all outputs to
-            default state. A value of 0 deactivates the watchdog.
-        debug: If True, debug information is printed.
-
     Attributes:
-        bus_terminals: A list of bus terminal classes according to the
+        bus_terminals (list[BusTerminal]): A list of bus terminal classes according to the
             connected terminals.
-        modbus: The underlying modbus client used for the connection.
+        modbus (SimpleModbusClient): The underlying modbus client used for the connection.
     """
 
     def __init__(self, host: str, port: int = 502, bus_terminals: Iterable[type[BusTerminal]] = [],
diff --git a/src/pyhoff/modbus.py b/src/pyhoff/modbus.py
index 50941ea..15a1166 100644
--- a/src/pyhoff/modbus.py
+++ b/src/pyhoff/modbus.py
@@ -48,20 +48,13 @@ class SimpleModbusClient:
     """
     A simple Modbus TCP client
 
-    Args:
-        host: hostname or IP address
-        port: server port
-        unit_id: ModBus id
-        timeout: socket timeout in seconds
-        debug: if True prints out transmitted and received bytes in hex
-
     Attributes:
-        host: hostname or IP address
-        port: server port
-        unit_id: ModBus id
-        timeout: socket timeout in seconds
-        last_error: contains last error message or empty string if no error occurred
-        debug: if True prints out transmitted and received bytes in hex
+        host (str): hostname or IP address
+        port (int): server port
+        unit_id (int): ModBus id
+        timeout (float): socket timeout in seconds
+        last_error (str): contains last error message or empty string if no error occurred
+        debug (bool): if True prints out transmitted and received bytes in hex
 
     """