diff --git a/app/assets/proto/ChannelSendMessage.proto b/app/assets/proto/ChannelSendMessage.proto
index 5a05083..1dd18d3 100644
--- a/app/assets/proto/ChannelSendMessage.proto
+++ b/app/assets/proto/ChannelSendMessage.proto
@@ -18,6 +18,9 @@ message ChannelSendMessage {
     uint64 reply_to = 8;
     RoomMessageForwardFrom forward_from = 9;
     uint64 random_id = 10;
+
+    uint32 additional_type = 11;
+    string additional_data = 12;
 }
 
 message ChannelSendMessageResponse {
diff --git a/app/assets/proto/ChatSendMessage.proto b/app/assets/proto/ChatSendMessage.proto
index 99a5449..3b85964 100644
--- a/app/assets/proto/ChatSendMessage.proto
+++ b/app/assets/proto/ChatSendMessage.proto
@@ -18,6 +18,9 @@ message ChatSendMessage {
     uint64 reply_to = 8;
     RoomMessageForwardFrom forward_from = 9;
     uint64 random_id = 10;
+
+    uint32 additional_type = 11;
+    string additional_data = 12;
 }
 
 message ChatSendMessageResponse {
diff --git a/app/assets/proto/Global.proto b/app/assets/proto/Global.proto
index f7125e1..5b00c52 100644
--- a/app/assets/proto/Global.proto
+++ b/app/assets/proto/Global.proto
@@ -227,6 +227,9 @@ message RoomMessage {
     uint64 previous_message_id = 18;
     uint64 random_id = 21;
 
+    uint32 additional_type = 23;
+    string additional_data = 24;
+
     enum ExtraType {
         NO_EXTRA = 0;
         CHANNEL_EXTRA = 1;
diff --git a/app/assets/proto/GroupSendMessage.proto b/app/assets/proto/GroupSendMessage.proto
index 68087bd..82ff75e 100644
--- a/app/assets/proto/GroupSendMessage.proto
+++ b/app/assets/proto/GroupSendMessage.proto
@@ -18,6 +18,9 @@ message GroupSendMessage {
     uint64 reply_to = 8;
     RoomMessageForwardFrom forward_from = 9;
     uint64 random_id = 10;
+
+    uint32 additional_type = 11;
+    string additional_data = 12;
 }
 
 message GroupSendMessageResponse {
diff --git a/docs/guide/v1/error/README.md b/docs/guide/v1/error/README.md
index 19e78fd..219058e 100644
--- a/docs/guide/v1/error/README.md
+++ b/docs/guide/v1/error/README.md
@@ -1423,6 +1423,8 @@ Bad payload for request [#201](../proto/README.md#action_201)
 | 31         	| Attachment is invalid                 	| *        	|
 | 32         	| **Message is too long**               	| *        	|
 | 33         	| Random id is invalid                    	| *        	|
+| 34         	| additional_type is invalid                | *        	|
+| 35         	| additional_data invalid                   | *        	|
 
 ### Error 204 - CHAT_SEND_MESSAGE_INTERNAL_SERVER_ERROR
 Internal server error for request [#201](../proto/README.md#action_201)
@@ -1796,6 +1798,8 @@ Bad payload for request [#310](../proto/README.md#action_310)
 | 31         	| Attachment is invalid                 	| *        	|
 | 32         	| **Message is too long**               	| *        	|
 | 33         	| Random id is invalid                    	| *        	|
+| 34         	| additional_type is invalid                | *        	|
+| 35         	| additional_data invalid                   | *        	|
 
 
 ### Error 307 - GROUP_SEND_MESSAGE_INTERNAL_SERVER_ERROR
@@ -2507,6 +2511,8 @@ Bad payload for request [#410](../proto/README.md#action_410)
 | 31         	| Attachment is invalid                 	| *        	|
 | 32         	| **Message is too long**               	| *        	|
 | 33         	| Random id is invalid                    	| *        	|
+| 34         	| additional_type is invalid                | *        	|
+| 35         	| additional_data invalid                   | *        	|
 
 
 ### Error 407 - CHANNEL_SEND_MESSAGE_INTERNAL_SERVER_ERROR