diff --git a/superfaktura/client_contacts.py b/superfaktura/client_contacts.py
index 89ae69c..a6a0c4b 100644
--- a/superfaktura/client_contacts.py
+++ b/superfaktura/client_contacts.py
@@ -1,3 +1,24 @@
+"""
+Module for interacting with client contacts in SuperFaktura.
+
+This module provides classes and functions for working with client contacts,
+including creating, reading, and updating contact information.
+
+Classes:
+    ClientException: Base class for client exceptions.
+    ClientContactModel: Dataclass representing a client contact.
+
+Functions:
+    (none)
+
+Variables:
+    (none)
+
+Notes:
+    This module uses the SuperFaktura API to interact with client contacts.
+    You must have a valid API key and credentials to use this module.
+"""
+
 import dataclasses
 import json
 from pprint import pprint
@@ -7,11 +28,13 @@ from superfaktura.superfaktura_api import SuperFakturaAPI
 
 
 class ClientException(Exception):
-    pass
+    """Base class for client exceptions."""
 
 
 @dataclasses.dataclass
 class ClientContactModel:
+    """Client contact model."""
+
     name: str
     address: Optional[str] = None
     bank_account: Optional[str] = None
@@ -48,6 +71,7 @@ class ClientContactModel:
     id: Optional[int] = None
 
     def as_dict(self) -> dict:
+        """Returns a dictionary representation of the ClientContactModel."""
         data = dataclasses.asdict(self)
         for key in list(data.keys()):
             if data[key] is None:
@@ -56,32 +80,34 @@ class ClientContactModel:
 
     @staticmethod
     def from_dict(data: dict) -> "ClientContactModel":
+        """Creates a ClientContactModel from a dictionary."""
         return ClientContactModel(
-            **{
-                k: v
-                for k, v in data.items()
-                if k in ClientContactModel.__dataclass_fields__
-            }
+            **{k: v for k, v in data.items() if k in ClientContactModel.__annotations__}
         )
 
 
 class ClientContact(SuperFakturaAPI):
+    """Client contact class."""
+
     def __init__(self):
         super().__init__()
 
     def add_contact(self, contact: ClientContactModel) -> bool:
+        """Adds a new client contact."""
         url = "clients/create"
         data = {"Client": contact.as_dict()}
-        resp = self.post(endpoint=url, data=json.dumps(data))
-        if resp["error_message"] == "Client created":
+        response = self.post(endpoint=url, data=json.dumps(data))
+        if response["error_message"] == "Client created":
             return True
         return False
 
     def list(self) -> dict:
+        """Lists all exists client contacts."""
         url = "clients/index.json"
         return self.get(endpoint=url)
 
     def get_client(self, client_id: int) -> ClientContactModel:
+        """Gets a client contact by ID."""
         url = f"clients/view/{client_id}"
         data = self.get(endpoint=url)
         if "Client" not in data: