diff --git a/superset-frontend/src/dashboard/components/gridComponents/ChartHolder.jsx b/superset-frontend/src/dashboard/components/gridComponents/ChartHolder.jsx
index a013679915786..69cf6c5c5175c 100644
--- a/superset-frontend/src/dashboard/components/gridComponents/ChartHolder.jsx
+++ b/superset-frontend/src/dashboard/components/gridComponents/ChartHolder.jsx
@@ -344,6 +344,7 @@ class ChartHolder extends React.Component {
               className={cx(
                 'dashboard-component',
                 'dashboard-component-chart-holder',
+                // The following class is added to support custom dashboard styling via the CSS editor
                 `dashboard-chart-id-${chartId}`,
                 this.state.outlinedComponentId ? 'fade-in' : 'fade-out',
                 isFullSize && 'full-size',