diff --git a/pyrogram/client/methods/chats/pin_chat_message.py b/pyrogram/client/methods/chats/pin_chat_message.py
index 5f7db61e..e9bc533e 100644
--- a/pyrogram/client/methods/chats/pin_chat_message.py
+++ b/pyrogram/client/methods/chats/pin_chat_message.py
@@ -22,7 +22,29 @@ from ...ext import BaseClient
 
 class PinChatMessage(BaseClient):
     def pin_chat_message(self, chat_id: int or str, message_id: int, disable_notification: bool = None):
-        # TODO: Docstrings
+        """Use this method to pin a message in a supergroup or a channel.
+        You must be an administrator in the chat for this to work and must have the "can_pin_messages" admin right in
+        the supergroup or "can_edit_messages" admin right in the channel.
+
+        Args:
+            chat_id (``int`` | ``str``):
+                Unique identifier (int) or username (str) of the target chat.
+                For a private channel/supergroup you can use its *t.me/joinchat/* link.
+
+            message_id (``int``):
+                Identifier of a message to pin.
+
+            disable_notification (``bool``):
+                Pass True, if it is not necessary to send a notification to all chat members about the new pinned
+                message. Notifications are always disabled in channels.
+
+        Returns:
+            True on success.
+
+        Raises:
+            :class:`Error <pyrogram.Error>`
+            ``ValueError``: If a chat_id doesn't belong to a supergroup or a channel.
+        """
         peer = self.resolve_peer(chat_id)
 
         if isinstance(peer, types.InputPeerChannel):