diff --git a/docs/class.md b/docs/class.md
index 1fb9ebe..659b98f 100644
--- a/docs/class.md
+++ b/docs/class.md
@@ -887,7 +887,7 @@ class A {}
 class B extends A {
   constructor() {
     super();
-    console.log(super.valueOf()); // B{}
+    console.log(super.valueOf() instanceof B); // true
   }
 }