diff --git a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
index 385aa8beb..f2a0b1028 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
@@ -5,9 +5,9 @@ namespace UniVRM10
 {
     /// <summary>
     /// VRM全体を制御するRoot
-    /// 
+    ///
     /// Importer(scripted importer) -> Prefab(editor/asset) -> Instance(scene/MonoBehavior) -> Runtime(play時)
-    /// 
+    ///
     /// * DefaultExecutionOrder(11000) means calculate springbone after FinalIK( VRIK )
     /// </summary>
     [AddComponentMenu("VRM10/VRMInstance")]
@@ -54,6 +54,10 @@ namespace UniVRM10
         private Vrm10Runtime m_runtime;
         private ControlRigGenerationOption m_controlRigGenerationOption = ControlRigGenerationOption.None;
 
+        /// <summary>
+        /// VRM ファイルに記録された Humanoid ボーンに対応します。
+        /// これは、コントロールリグのボーンとは異なります。
+        /// </summary>
         public UniHumanoid.Humanoid Humanoid
         {
             get
diff --git a/Assets/VRM10/Runtime/Components/Vrm10Runtime/ControlRig/ControlRigGenerationOption.cs b/Assets/VRM10/Runtime/Components/Vrm10Runtime/ControlRig/ControlRigGenerationOption.cs
index 54f133111..6ebb0e6e4 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Runtime/ControlRig/ControlRigGenerationOption.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Runtime/ControlRig/ControlRigGenerationOption.cs
@@ -2,8 +2,15 @@
 {
     public enum ControlRigGenerationOption
     {
+        /// <summary>
+        /// コントロールリグを生成しません。
+        /// </summary>
         None,
-        Additive,
-        Override,
+
+        /// <summary>
+        /// 推奨されるオプションです。
+        /// コントロールリグのボーン Transform を生成し、Root の Animator はコントロールリグのボーンを制御するようになります。
+        /// </summary>
+        Generate,
     }
 }
\ No newline at end of file
diff --git a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10RuntimeControlRig.cs b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10RuntimeControlRig.cs
index 25f87a32b..cb4f6f05d 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10RuntimeControlRig.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10RuntimeControlRig.cs
@@ -35,30 +35,16 @@ namespace UniVRM10
             _controlRigRoot = new GameObject("Runtime Control Rig").transform;
             _controlRigRoot.SetParent(vrmRoot);
 
-            var avatarRoot = option switch
-            {
-                ControlRigGenerationOption.Additive => _controlRigRoot,
-                ControlRigGenerationOption.Override => vrmRoot,
-                ControlRigGenerationOption.None => null,
-                _ => throw new ArgumentOutOfRangeException(nameof(option), option, null)
-            };
-
             _hipBone = Vrm10ControlBone.Build(humanoid, out _bones);
             _hipBone.ControlBone.SetParent(_controlRigRoot);
 
             InitialHipsHeight = _hipBone.ControlTarget.position.y;
 
             var transformBonePairs = _bones.Select(kv => (kv.Value.ControlBone, kv.Key));
-            _controlRigAvatar = HumanoidLoader.LoadHumanoidAvatar(avatarRoot, transformBonePairs);
+            _controlRigAvatar = HumanoidLoader.LoadHumanoidAvatar(vrmRoot, transformBonePairs);
             _controlRigAvatar.name = "Runtime Control Rig";
 
-            ControlRigAnimator = option switch
-            {
-                ControlRigGenerationOption.Additive => _controlRigRoot.gameObject.AddComponent<Animator>(),
-                ControlRigGenerationOption.Override => vrmRoot.GetComponent<Animator>(),
-                ControlRigGenerationOption.None => null,
-                _ => throw new ArgumentOutOfRangeException(nameof(option), option, null)
-            };
+            ControlRigAnimator = vrmRoot.GetComponent<Animator>();
             ControlRigAnimator.avatar = _controlRigAvatar;
         }
 
diff --git a/Assets/VRM10/Runtime/IO/Vrm10.cs b/Assets/VRM10/Runtime/IO/Vrm10.cs
index 6e5c68b0d..bf9c74ee4 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10.cs
@@ -37,7 +37,7 @@ namespace UniVRM10
         public static async Task<Vrm10Instance> LoadPathAsync(
             string path,
             bool canLoadVrm0X = true,
-            ControlRigGenerationOption controlRigGenerationOption = ControlRigGenerationOption.Override,
+            ControlRigGenerationOption controlRigGenerationOption = ControlRigGenerationOption.Generate,
             bool showMeshes = true,
             IAwaitCaller awaitCaller = null,
             IMaterialDescriptorGenerator materialGenerator = null,
@@ -81,7 +81,7 @@ namespace UniVRM10
         public static async Task<Vrm10Instance> LoadBytesAsync(
             byte[] bytes,
             bool canLoadVrm0X = true,
-            ControlRigGenerationOption controlRigGenerationOption = ControlRigGenerationOption.Override,
+            ControlRigGenerationOption controlRigGenerationOption = ControlRigGenerationOption.Generate,
             bool showMeshes = true,
             IAwaitCaller awaitCaller = null,
             IMaterialDescriptorGenerator materialGenerator = null,