--- title: updateChatTopMessage description: Top message of the chat has changed. If top_message is null then top message in the chat became unknown. Some new unknown messages might be added to the chat in that case image: https://docs.madelineproto.xyz/favicons/android-chrome-256x256.png --- # Constructor: updateChatTopMessage [Back to constructors index](index.md) Top message of the chat has changed. If top_message is null then top message in the chat became unknown. Some new unknown messages might be added to the chat in that case ### Attributes: | Name | Type | Required | Description | |----------|---------------|----------|-------------| |chat\_id|[int53](../types/int53.md) | Yes|Chat identifier| |top\_message|[message](../constructors/message.md) | Yes|New top message of the chat, nullable| |order|[int64](../constructors/int64.md) | Yes|New value of the chat order| ### Type: [Update](../types/Update.md)