diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index 446c0a1d11b1a..f27cca6bf366b 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -5613,6 +5613,11 @@ message MetricsEvent {
     // OS: P
     SETTINGS_ZEN_ONBOARDING = 1380;
 
+    // OPEN: Settings > Display > Auto brightness
+    // CATEGORY: SETTINGS
+    // OS: P
+    SETTINGS_AUTO_BRIGHTNESS = 1381;
+
     // ---- End P Constants, all P constants go above this line ----
     // Add new aosp constants above this line.
     // END OF AOSP CONSTANTS