diff --git a/packages/devtools_app/lib/src/screens/memory/panes/chart/controller/chart_connection.dart b/packages/devtools_app/lib/src/screens/memory/panes/chart/controller/chart_connection.dart
index 0f70fb3d39e..b70e448365b 100644
--- a/packages/devtools_app/lib/src/screens/memory/panes/chart/controller/chart_connection.dart
+++ b/packages/devtools_app/lib/src/screens/memory/panes/chart/controller/chart_connection.dart
@@ -49,6 +49,9 @@ class ChartConnection extends DisposableController
   void _stopConnection() {
     _polling?.cancel();
     _polling = null;
+    // We use state to declare disconnection.
+    // We cannot use nullness of _polling to check disconnection, because there is async gap in
+    // `maybeInitialize` when state is already initialized, but _polling is still null.
     state = ChartConnectionState.stopped;
   }