diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index 85bf886f8c534..36dee49905c4c 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -3413,6 +3413,9 @@ message MetricsEvent {
     // FIELD - The context (source) from which an action is performed
     FIELD_CONTEXT = 833;
 
+    // ACTION: Settings advanced button is expanded
+    ACTION_SETTINGS_ADVANCED_BUTTON_EXPAND = 834;
+
     // ---- End O Constants, all O constants go above this line ----
 
     // Add new aosp constants above this line.