diff --git a/src/api/server.py b/src/api/server.py
index 8e6a677..f5784d2 100644
--- a/src/api/server.py
+++ b/src/api/server.py
@@ -24,11 +24,27 @@
 CONFIG_PATH = "config/config.yaml"
 
 class ConfigUpdate(BaseModel):
+    """
+    Pydantic model for updating configuration sections.
+
+    Attributes:
+        section (str): The name of the configuration section to update (e.g., "translation_settings").
+        data (Dict): A dictionary containing the key-value pairs to update within that section.
+    """
     section: str
     data: Dict
 
 @app.get("/config")
 def get_config():
+    """
+    Retrieves the current application configuration from config/config.yaml.
+
+    Raises:
+        HTTPException: If the config file is not found (status_code=404).
+
+    Returns:
+        Dict: The loaded configuration as a dictionary.
+    """
     if not os.path.exists(CONFIG_PATH):
         raise HTTPException(status_code=404, detail="Config file not found")
     with open(CONFIG_PATH, "r", encoding="utf-8") as f:
@@ -36,6 +52,18 @@ def get_config():
 
 @app.post("/config")
 def update_config(update: ConfigUpdate):
+    """
+    Updates a specific section of the application configuration.
+
+    If the section exists, its data is updated. If the section does not exist,
+    it is created. The updated configuration is then saved back to config/config.yaml.
+
+    Args:
+        update (ConfigUpdate): An object containing the section to update and the data.
+
+    Returns:
+        Dict: A status message indicating success.
+    """
     with open(CONFIG_PATH, "r", encoding="utf-8") as f:
         config = yaml.safe_load(f)
     
@@ -50,17 +78,38 @@ def update_config(update: ConfigUpdate):
 
 # WebSocket để truyền progress
 class ConnectionManager:
+    """
+    Manages active WebSocket connections for broadcasting progress updates.
+    """
     def __init__(self):
         self.active_connections: List[WebSocket] = []
 
     async def connect(self, websocket: WebSocket):
+        """
+        Establishes a new WebSocket connection and adds it to the active connections.
+
+        Args:
+            websocket (WebSocket): The WebSocket object for the new connection.
+        """
         await websocket.accept()
         self.active_connections.append(websocket)
 
     def disconnect(self, websocket: WebSocket):
+        """
+        Removes a WebSocket connection from the active connections.
+
+        Args:
+            websocket (WebSocket): The WebSocket object to disconnect.
+        """
         self.active_connections.remove(websocket)
 
     async def broadcast(self, message: str):
+        """
+        Broadcasts a message to all active WebSocket connections.
+
+        Args:
+            message (str): The message to be sent to all connected clients.
+        """
         for connection in self.active_connections:
             await connection.send_text(message)
 
@@ -68,6 +117,15 @@ async def broadcast(self, message: str):
 
 @app.websocket("/ws/progress")
 async def websocket_endpoint(websocket: WebSocket):
+    """
+    WebSocket endpoint for real-time progress updates.
+
+    Clients can connect to this endpoint to receive broadcast messages
+    about the application's progress (e.g., translation status).
+
+    Args:
+        websocket (WebSocket): The incoming WebSocket connection.
+    """
     await manager.connect(websocket)
     try:
         while True: