diff --git a/Functions.md b/Functions.md
index cd9b01a..9a66a6f 100644
--- a/Functions.md
+++ b/Functions.md
@@ -2,7 +2,7 @@
 
 ## AsyncFunction
 
-JScript does not support the `async` keyword. So, WelsonJS uses the `AsyncFunction` class made by itself.
+JScript does not support the `async` and `Generator` keywords. So, WelsonJS uses the `AsyncFunction`, `GeneratorFunction` class made by itself.
 
 ### Examples
 
@@ -53,6 +53,19 @@ exports.onShoutcut = onShoutcut;
 exports.sub_01 = sub_01;
 ```
 
+## GeneratorFunction
+
+```js
+var a = new GeneratorFunction(function(_yield) {
+    _yield("a");
+    _yield("b");
+    _yield("c");
+});
+console.log(a.next().value);
+console.log(a.next().value);
+console.log(a.next().value);
+```
+
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