diff --git a/documentation/customizing.md b/documentation/customizing.md
index a7c6f744a..8a77b8a41 100644
--- a/documentation/customizing.md
+++ b/documentation/customizing.md
@@ -214,7 +214,7 @@ class _NetworkImageNodeWidget extends StatefulWidget {
 }
 
 class __NetworkImageNodeWidgetState extends State<_NetworkImageNodeWidget>
-    with Selectable {
+    with SelectableMixin {
   RenderBox get _renderBox => context.findRenderObject() as RenderBox;
 
   @override