diff --git a/files/en-us/web/javascript/guide/using_classes/index.md b/files/en-us/web/javascript/guide/using_classes/index.md
index d4576745deb4cb7..fe5b4b91001be6f 100644
--- a/files/en-us/web/javascript/guide/using_classes/index.md
+++ b/files/en-us/web/javascript/guide/using_classes/index.md
@@ -725,7 +725,7 @@ For example, one thing that makes `Date` objects infamous is that they're _mutab
 
 ```js
 function incrementDay(date) {
-  return date.setDate(date.getDate() + 1);
+  return new Date(date.setDate(date.getDate() + 1));
 }
 const date = new Date(); // 2019-06-19
 const newDay = incrementDay(date);
diff --git a/files/en-us/web/javascript/reference/global_objects/generator/index.md b/files/en-us/web/javascript/reference/global_objects/generator/index.md
index 082e915c506c92b..586087fdaccc158 100644
--- a/files/en-us/web/javascript/reference/global_objects/generator/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/generator/index.md
@@ -8,7 +8,7 @@ sidebar: jsref
 
 The **`Generator`** object is returned by a {{jsxref("Statements/function*", "generator function", "", 1)}} and it conforms to both the [iterable protocol](/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterable_protocol) and the [iterator protocol](/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterator_protocol).
 
-`Generator` is a subclass of the hidden {{jsxref("Iterator")}} class.
+`Generator` is a subclass of the {{jsxref("Iterator")}} class.
 
 ## Constructor