diff --git a/proto/src/system_messages.proto b/proto/src/system_messages.proto
index 21d0979..b403a7f 100644
--- a/proto/src/system_messages.proto
+++ b/proto/src/system_messages.proto
@@ -404,5 +404,9 @@
 
     // Notify the user that audio was lowered based on Calculated Sound Dose (CSD)
     NOTE_CSD_LOWER_AUDIO = 1007;
+
+    // Notify the user about external display events related to screenshot.
+    // Package: com.android.systemui
+    NOTE_GLOBAL_SCREENSHOT_EXTERNAL_DISPLAY = 1008;
   }
 }