def set_chat_description(
        self,
        chat_id: Union[int, str],
        description: str
    ) -> bool:
        """Use this method to change the description of a supergroup or a channel.
        You must be an administrator in the chat for this to work and must have the appropriate admin rights.

        Args:
            chat_id (``int`` | ``str``):
                Unique identifier (int) or username (str) of the target chat.

            description (``str``):
                New chat description, 0-255 characters.

        Returns:
            True on success.

        Raises:
            :class:`RPCError <pyrogram.RPCError>` in case of a Telegram RPC 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, types.InputPeerChat)):
            self.send(
                functions.messages.EditChatAbout(
                    peer=peer,
                    about=description
                )
            )
        else:
            raise ValueError("The chat_id \"{}\" belongs to a user".format(chat_id))

        return True