diff --git a/docs/generator.md b/docs/generator.md
index ae00285..56f14e6 100644
--- a/docs/generator.md
+++ b/docs/generator.md
@@ -1076,6 +1076,7 @@ function* g() {
 }
 
 let obj = g();
+obj.next();
 obj.a // undefined
 ```