diff --git a/lib/src/widgets/editor.dart b/lib/src/widgets/editor.dart
index fb4a86cd..30af9b0d 100644
--- a/lib/src/widgets/editor.dart
+++ b/lib/src/widgets/editor.dart
@@ -46,6 +46,8 @@ const linkPrefixes = [
   'http'
 ];
 
+/// Base interface for the editor state which defines contract used by
+/// various mixins.
 abstract class EditorState extends State<RawEditor>
     implements TextSelectionDelegate {
   ScrollController get scrollController;