diff --git a/gui/src/Visualization/VisualizationTabWidget.cpp b/gui/src/Visualization/VisualizationTabWidget.cpp
index bfa0d6a..7d68276 100644
--- a/gui/src/Visualization/VisualizationTabWidget.cpp
+++ b/gui/src/Visualization/VisualizationTabWidget.cpp
@@ -71,6 +71,7 @@ void VisualizationTabWidget::accept(IVisualizationWidgetVisitor *visitor)
         // Apply visitor to zone children
         for (auto i = 0; i < layout()->count(); ++i) {
             if (auto item = layout()->itemAt(i)) {
+                // Widgets different from zones are not visited (no action)
                 if (auto visualizationZoneWidget
                     = dynamic_cast<VisualizationZoneWidget *>(item->widget())) {
                     visualizationZoneWidget->accept(visitor);
diff --git a/gui/src/Visualization/VisualizationWidget.cpp b/gui/src/Visualization/VisualizationWidget.cpp
index 65a7fee..c0467e6 100644
--- a/gui/src/Visualization/VisualizationWidget.cpp
+++ b/gui/src/Visualization/VisualizationWidget.cpp
@@ -89,6 +89,7 @@ void VisualizationWidget::accept(IVisualizationWidgetVisitor *visitor)
 
         // Apply visitor for tab children
         for (auto i = 0; i < ui->tabWidget->count(); ++i) {
+            // Widgets different from tabs are not visited (no action)
             if (auto visualizationTabWidget
                 = dynamic_cast<VisualizationTabWidget *>(ui->tabWidget->widget(i))) {
                 visualizationTabWidget->accept(visitor);
diff --git a/gui/src/Visualization/VisualizationZoneWidget.cpp b/gui/src/Visualization/VisualizationZoneWidget.cpp
index 75970ce..0d60830 100644
--- a/gui/src/Visualization/VisualizationZoneWidget.cpp
+++ b/gui/src/Visualization/VisualizationZoneWidget.cpp
@@ -66,6 +66,7 @@ void VisualizationZoneWidget::accept(IVisualizationWidgetVisitor *visitor)
         auto layout = ui->visualizationZoneFrame->layout();
         for (auto i = 0; i < layout->count(); ++i) {
             if (auto item = layout->itemAt(i)) {
+                // Widgets different from graphs are not visited (no action)
                 if (auto visualizationGraphWidget
                     = dynamic_cast<VisualizationGraphWidget *>(item->widget())) {
                     visualizationGraphWidget->accept(visitor);