diff --git a/docs/unity/bindings.md b/docs/unity/bindings.md
index afe2241c..87ca4b91 100644
--- a/docs/unity/bindings.md
+++ b/docs/unity/bindings.md
@@ -155,8 +155,7 @@ And set the returned object into a module.
 Here we set it into `builtins` module, so that it can be accessed from anywhere.
 
 ```csharp
-var type = vm.RegisterType(new PyVector2Type());
-vm.builtins.attr["Vector2"] = type;
+vm.RegisterType(new PyVector2Type(), vm.builtins);
 ```
 
 To summarize, manual static bindings provide detailed control for exposing a C# class to Python.
@@ -169,8 +168,7 @@ Automatic static bindings use C# reflection to automatically generate bindings f
 It is convenient for testing and prototyping, but it is slow and unsafe since the user can access any member of the class.
 
 ```csharp
-var type = vm.RegisterAutoType<Vector2>();
-vm.builtins.attr["Vector2"] = type;
+vm.RegisterAutoType<Vector2>(vm.builtins);
 ```
 
 That's all you need to do. The `RegisterAutoType<T>` method will automatically generate bindings for `Vector2`.
diff --git a/docs/unity/introduction.md b/docs/unity/introduction.md
index 965d680b..26170b68 100644
--- a/docs/unity/introduction.md
+++ b/docs/unity/introduction.md
@@ -4,16 +4,79 @@ icon: dot
 order: 30
 ---
 
-# Welcome to PocketPyUnity
+# Welcome to PocketPython
 
-PocketPyUnity is a C# plugin that allows you to do Python scripting in [Unity](https://unity.com/).
-It provides a sandboxed Python environment, adding dynamic capabilities to your game,
-which can be used for dynamic game logic, modding, hot fixing, and more.
+PocketPython is a C# plugin that allows you to do Python scripting in Unity. It provides a sandboxed Python environment, which adds dynamic capabilities to your game, which can be used for dynamic game logic, modding, hot fixing, and more.
 
-The virtual machine is written in **pure C#**,
-which means you can fully control the internal state of the Python interpreter.
+The virtual machine is written in pure C#, which means you can fully control the internal state of the Python interpreter.
 
 !!!
-PocketPyUnity is designed for game scripting, not for scientific computing.
+PocketPython is designed for game scripting, not for scientific computing.
 You cannot use it to run NumPy, OpenCV, or any other CPython extension modules.
-!!!
\ No newline at end of file
+!!!
+
+
+## Features
+
+### Python 3.x Syntax
+
+PocketPython uses [pocketpy](https://github.com/blueloveTH/pocketpy)
+as frontend to parse and compile Python source code.
+It supports most of the Python 3.x syntax.
+
+The following table shows a feature comparison of PocketPython
+with respect to the original [pocketpy](https://github.com/blueloveTH/pocketpy).
+The features marked with `YES` are supported, and the features marked with `NO` are not supported.
+
+| Name            | Example                         | Cpp | Unity |
+| --------------- | ------------------------------- | --------- | --- |
+| If Else         | `if..else..elif`                | YES       | YES |
+| Loop            | `for/while/break/continue`      | YES       | YES |
+| Function        | `def f(x,*args,y=1):`           | YES       | YES |
+| Subclass        | `class A(B):`                   | YES       | YES |
+| List            | `[1, 2, 'a']`                   | YES       | YES |
+| ListComp        | `[i for i in range(5)]`         | YES       | YES |
+| Slice           | `a[1:2], a[:2], a[1:]`          | YES       | YES |
+| Tuple           | `(1, 2, 'a')`                   | YES       | YES |
+| Dict            | `{'a': 1, 'b': 2}`              | YES       | YES |
+| F-String        | `f'value is {x}'`               | YES       | YES |
+| Unpacking       | `a, b = 1, 2`                   | YES       | YES |
+| Star Unpacking  | `a, *b = [1, 2, 3]`             | YES       | YES |
+| Exception       | `raise/try..catch`              | YES       | NO |
+| Dynamic Code    | `eval()/exec()`                 | YES       | NO |
+| Reflection      | `hasattr()/getattr()/setattr()` | YES       | YES |
+| Import          | `import/from..import`           | YES       | YES |
+| Context Block   | `with <expr> as <id>:`          | YES       | NO |
+| Type Annotation | `def  f(a:int, b:float=1)`      | YES       | YES |
+| Generator       | `yield i`                       | YES       | NO |
+| Decorator       | `@cache`                        | YES       | YES |
+
+### Sandboxed Python Environment
+
+PocketPython provides a sandboxed Python environment.
+All python code is executed in a C# virtual machine.
+The user cannot access the file system, network, or any other resources of the host machine.
+
+### Seemless Interop with C#
+
+PocketPython uses `object` in C# to represent dynamic typed Python objects.
+Most of the basic Python types correspond to a C# type,
+which means passing arguments between C# and Python is extremely easy and intuitive.
+
+| Python Type | C# Type |
+| ----------- | ------- |
+| `None`      | `PocketPy.NoneType` |
+| `bool`      | `System.Boolean` |
+| `int`       | `System.Int32` |
+| `float`     | `System.Single` |
+| `str`       | `System.String` |
+| `tuple`     | `System.Object[]` |
+| `list`      | `System.Collections.Generic.List<object>` |
+| `dict`      | `System.Collections.Generic.Dictionary<PocketPy.PyDictKey, object>` |
+| ...         | ... |
+
+### Lua Style API
+
+PocketPython also provides a Lua style API for C# in `LuaBindings` class.
+It uses cpp implemented virtual machine instead of C# virtual machine.
+It is faster than C# virtual machine, but it is not sandboxed.
\ No newline at end of file