diff --git a/aconfig/launcher_overview.aconfig b/aconfig/launcher_overview.aconfig
index 61cdc75fc9..c6fb8bfc7f 100644
--- a/aconfig/launcher_overview.aconfig
+++ b/aconfig/launcher_overview.aconfig
@@ -97,3 +97,10 @@ flag {
         purpose: PURPOSE_BUGFIX
     }
 }
+
+flag {
+    name: "enable_simultaneous_overview_trigger_on_extended_desktop"
+    namespace: "launcher_overview"
+    description: "Enable Overview to launch and exit simultaneously on default and external displays wherever it was triggered or quit from"
+    bug:  "421128035"
+}