diff --git a/main.py b/main.py
index 1bac7a5..0091e0e 100644
--- a/main.py
+++ b/main.py
@@ -15,7 +15,8 @@ class MatrixBot:
     __AUTHOR__      = 'anima'
     __VERSION__     = '0.6.3'
     def __init__(self, config_file: str = 'bot.conf', session_file: str = 'session.tmp') -> None:
-        """
+        """Initialize the MatrixBot instance.
+
         Args:
             config_file (str, optional): path to config file
             session_file (str, optional): path to session file
@@ -36,7 +37,11 @@ class MatrixBot:
             exit(1)
 
     def _load_config(self) -> bool:
-        """load given config file"""
+        """Load given config file.
+
+        Returns:
+            bool: True if config file was loaded successfully
+        """
         if not os.path.exists(self.config_file):
             return False
         logging.info(f'load config from file {self.config_file}')
@@ -52,7 +57,7 @@ class MatrixBot:
         return True
 
     def _save_session(self) -> bool:
-        """save session data as file
+        """Save session data as file.
 
         Returns:
             bool: True if file was saved
@@ -68,10 +73,10 @@ class MatrixBot:
         return True
 
     def _load_session(self) -> bool:
-        """load session date from file
+        """Load session date from file.
 
         Returns:
-            bool: True if file was found and load
+            bool: True if file was found and loaded
         """
         if not os.path.exists(self.session_file):
             return False
@@ -84,7 +89,7 @@ class MatrixBot:
         return True
 
     async def _login(self) -> bool:
-        """restore login with session file or run full login process
+        """Restore login with session file or run full login process.
 
         Returns:
             bool: True when bot has a valid login
@@ -106,20 +111,20 @@ class MatrixBot:
             return True
         return False
 
-    def _find_skills(self):
-        """search all modules in skill folder and init these"""
+    def _find_skills(self) -> None:
+        """Search all modules in skill folder and init these."""
         skills_path = pathlib.Path(__file__).parent / "skills"
         for module in skills_path.iterdir():
             if module.is_dir() and (module / "__init__.py").exists():
                 importlib.import_module(f"skills.{module.name}")
 
-    async def _activate_skills(self):
-        """activate all skills which defined in config file"""
+    async def _activate_skills(self) -> None:
+        """Activate all skills which defined in config file."""
         for skill in self._config['skills'].keys():
             await self.load_skill(skill_name=skill, config=self._config['skills'][skill])
 
     async def load_skill(self, skill_name: str, config: dict = None) -> bool:
-        """load skill from skill registry
+        """Load skill from skill registry.
 
         Args:
             skill_name (str): name of skill (same as classname)
@@ -136,24 +141,26 @@ class MatrixBot:
         self.skills.append(skill)
         return True
 
-    def unload_skill(self):
+    def unload_skill(self) -> None:
+        """Unload a skill."""
         pass
 
     async def send_status(self, message: str) -> bool:
-        """send a message to a predefined room
+        """Send a message to a predefined room.
 
         Args:
             message (str): message content
 
         Returns:
-            bool: True if message send
+            bool: True if message sent
         """
         if self.silence:
             return False
         await self.helper.send_message(f"{self._config['general']['status_room']}:{self.domain}", message)
         return True
 
-    async def run(self):
+    async def run(self) -> None:
+        """Run the bot."""
         if await self._login():
             del self.__password
             await self.send_status(f"{self.botname} Online!")