diff --git a/protos/launcher_atom.proto b/protos/launcher_atom.proto
index c638ba9..59829a6 100644
--- a/protos/launcher_atom.proto
+++ b/protos/launcher_atom.proto
@@ -128,6 +128,11 @@
 
   // Bit encoded value to capture pinned and predicted taskbar positions.
   optional int32 cardinality = 2;
+
+  // Container where taskbar was invoked.
+  oneof ParentContainer {
+    TaskSwitcherContainer task_switcher_container = 3;
+  }
 }
 
 // Next value 44