diff --git a/schemas/botapi.json b/schemas/botapi.json
index 0653ed4..b06abcd 100644
--- a/schemas/botapi.json
+++ b/schemas/botapi.json
@@ -463,7 +463,7 @@
                         "User"
                     ],
                     "optional": true,
-                    "description": "Optional. Sender, empty for messages sent to channels"
+                    "description": "Optional. Sender of the message; empty for messages sent to channels. For backward compatibility, the field contains a fake sender user in non-channel chats, if the message was sent on behalf of a chat."
                 },
                 {
                     "name": "sender_chat",
@@ -471,7 +471,7 @@
                         "Chat"
                     ],
                     "optional": true,
-                    "description": "Optional. Sender of the message, sent on behalf of a chat. The channel itself for channel messages. The supergroup itself for messages from anonymous group administrators. The linked channel for messages automatically forwarded to the discussion group"
+                    "description": "Optional. Sender of the message, sent on behalf of a chat. For backward compatibility, the field from contains a fake sender user in non-channel chats, if the message was sent on behalf of a chat."
                 },
                 {
                     "name": "date",
diff --git a/schemas/botapi.yaml b/schemas/botapi.yaml
index 78f452d..822810a 100644
--- a/schemas/botapi.yaml
+++ b/schemas/botapi.yaml
@@ -347,13 +347,13 @@ types:
                 types:
                     - User
                 optional: true
-                description: 'Optional. Sender, empty for messages sent to channels'
+                description: 'Optional. Sender of the message; empty for messages sent to channels. For backward compatibility, the field contains a fake sender user in non-channel chats, if the message was sent on behalf of a chat.'
             -
                 name: sender_chat
                 types:
                     - Chat
                 optional: true
-                description: 'Optional. Sender of the message, sent on behalf of a chat. The channel itself for channel messages. The supergroup itself for messages from anonymous group administrators. The linked channel for messages automatically forwarded to the discussion group'
+                description: 'Optional. Sender of the message, sent on behalf of a chat. For backward compatibility, the field from contains a fake sender user in non-channel chats, if the message was sent on behalf of a chat.'
             -
                 name: date
                 types: