diff --git a/packages/lib/services/plugins/reducer.ts b/packages/lib/services/plugins/reducer.ts
index e63effd163e..de9a3be7366 100644
--- a/packages/lib/services/plugins/reducer.ts
+++ b/packages/lib/services/plugins/reducer.ts
@@ -5,6 +5,10 @@ import { ButtonSpec } from './api/types';
 export interface PluginViewState {
 	id: string;
 	type: string;
+	// Note that this property will mean different thing depending on the `containerType`. If it's a
+	// dialog, it means that the dialog is opened. If it's a panel, it means it's visible/opened. If
+	// it's an editor, it means the editor is currently active (but it may not be visible - see
+	// JoplinViewsEditor).
 	opened: boolean;
 	buttons: ButtonSpec[];
 	fitToContent?: boolean;