diff --git a/apache/rocketmq/v2/admin.proto b/apache/rocketmq/v2/admin.proto
index c34a22e..ef15f1a 100644
--- a/apache/rocketmq/v2/admin.proto
+++ b/apache/rocketmq/v2/admin.proto
@@ -383,6 +383,10 @@ message AdminSendMessageRequest {
   map<string, string> user_properties = 5;
   // System properties of the message.
   optional SystemProperties system_properties = 6;
+  // Request-scoped extension information. Unknown entries should be ignored.
+  // Known keys:
+  // - protocol_type: Protocol used by the original producer (REMOTING or GRPC_V2).
+  map<string, string> ext_info = 7;
 }
 
 message AdminSendMessageResponse {