diff --git a/Assets/VRM/Runtime/IO/MaterialIO/BuiltInRP/Import/BuiltInVrmMaterialDescriptorGenerator.cs b/Assets/VRM/Runtime/IO/MaterialIO/BuiltInRP/Import/BuiltInVrmMaterialDescriptorGenerator.cs
index b156b2df9..7321f8f02 100644
--- a/Assets/VRM/Runtime/IO/MaterialIO/BuiltInRP/Import/BuiltInVrmMaterialDescriptorGenerator.cs
+++ b/Assets/VRM/Runtime/IO/MaterialIO/BuiltInRP/Import/BuiltInVrmMaterialDescriptorGenerator.cs
@@ -5,6 +5,9 @@ using UnityEngine;
 
 namespace VRM
 {
+    /// <summary>
+    /// A class that generates MaterialDescriptor by considering the VRM 0.X extension included in the glTF data to be imported.
+    /// </summary>
     public sealed class BuiltInVrmMaterialDescriptorGenerator : IMaterialDescriptorGenerator
     {
         private readonly glTF_VRM_extensions _vrm;
diff --git a/Assets/VRM/Runtime/IO/MaterialIO/URP/Import/UrpVrmMaterialDescriptorGenerator.cs b/Assets/VRM/Runtime/IO/MaterialIO/URP/Import/UrpVrmMaterialDescriptorGenerator.cs
index fc141e10e..8e2f818c8 100644
--- a/Assets/VRM/Runtime/IO/MaterialIO/URP/Import/UrpVrmMaterialDescriptorGenerator.cs
+++ b/Assets/VRM/Runtime/IO/MaterialIO/URP/Import/UrpVrmMaterialDescriptorGenerator.cs
@@ -5,6 +5,9 @@ using UnityEngine;
 
 namespace VRM
 {
+    /// <summary>
+    /// A class that generates MaterialDescriptor by considering the VRM 0.X extension included in the glTF data to be imported.
+    /// </summary>
     public sealed class UrpVrmMaterialDescriptorGenerator : IMaterialDescriptorGenerator
     {
         private readonly glTF_VRM_extensions _vrm;
diff --git a/Assets/VRM10/Runtime/IO/Material/BuiltInRP/Import/BuiltInVrm10MaterialDescriptorGenerator.cs b/Assets/VRM10/Runtime/IO/Material/BuiltInRP/Import/BuiltInVrm10MaterialDescriptorGenerator.cs
index e4d7c082b..afae34869 100644
--- a/Assets/VRM10/Runtime/IO/Material/BuiltInRP/Import/BuiltInVrm10MaterialDescriptorGenerator.cs
+++ b/Assets/VRM10/Runtime/IO/Material/BuiltInRP/Import/BuiltInVrm10MaterialDescriptorGenerator.cs
@@ -5,6 +5,9 @@ using UnityEngine;
 
 namespace UniVRM10
 {
+    /// <summary>
+    /// A class that generates MaterialDescriptor by considering the VRM 1.0 extension included in the glTF data to be imported.
+    /// </summary>
     public sealed class BuiltInVrm10MaterialDescriptorGenerator : IMaterialDescriptorGenerator
     {
         public BuiltInGltfPbrMaterialImporter PbrMaterialImporter { get; } = new();
diff --git a/Assets/VRM10/Runtime/IO/Material/URP/Import/UrpVrm10MaterialDescriptorGenerator.cs b/Assets/VRM10/Runtime/IO/Material/URP/Import/UrpVrm10MaterialDescriptorGenerator.cs
index 63b747d77..900e95075 100644
--- a/Assets/VRM10/Runtime/IO/Material/URP/Import/UrpVrm10MaterialDescriptorGenerator.cs
+++ b/Assets/VRM10/Runtime/IO/Material/URP/Import/UrpVrm10MaterialDescriptorGenerator.cs
@@ -5,6 +5,9 @@ using UnityEngine;
 
 namespace UniVRM10
 {
+    /// <summary>
+    /// A class that generates MaterialDescriptor by considering the VRM 1.0 extension included in the glTF data to be imported.
+    /// </summary>
     public sealed class UrpVrm10MaterialDescriptorGenerator : IMaterialDescriptorGenerator
     {
         public UrpGltfPbrMaterialImporter PbrMaterialImporter { get; } = new();