diff --git a/protos/message.proto b/protos/message.proto
index 721af450b..75ade5f29 100644
--- a/protos/message.proto
+++ b/protos/message.proto
@@ -926,6 +926,7 @@ message TerminalOpened {
   uint32 pid = 4;
   string service_id = 5;  // Service ID for persistent sessions
   repeated int32 persistent_sessions = 6; // Used to restore the persistent sessions.
+  bool replay_terminal_output = 7; // Whether the next data response replays buffered terminal output.
 }
 
 message TerminalClosed {