diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/IMaterialDescriptorGenerator.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/IMaterialDescriptorGenerator.cs
index f9cf47e42..5f6afcc46 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/IMaterialDescriptorGenerator.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/IMaterialDescriptorGenerator.cs
@@ -1,17 +1,25 @@
 namespace UniGLTF
 {
     /// <summary>
-    /// generate a unity Material from a glTFMaterial.
+    /// 指定の index の glTFMaterial から Import できる Material の生成情報を生成する。
+    /// glTFMaterial と Unity Material は 1:1 対応する。
+    /// 
+    /// IMaterialDescriptorGenerator の使われ方は MaterialFactory.LoadAsync を参照 
     /// </summary>
     public interface IMaterialDescriptorGenerator
     {
         /// <summary>
         /// Generate the MaterialDescriptor generated from the index i.
+        /// <code>
+        /// glTFMaterial src = data.GLTF.materials[i];
+        /// return new MaterialDescriptor();
+        /// </code>        
         /// </summary>
         MaterialDescriptor Get(GltfData data, int i);
 
         /// <summary>
-        /// Generate the MaterialDescriptor for the non-specified glTF material.
+        /// Generate the fallback MaterialDescriptor for the non-specified glTF material.
+        /// <see href="https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#default-material"/>
         /// </summary>
         MaterialDescriptor GetGltfDefault(string materialName = null);
     }
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/MaterialDescriptor.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/MaterialDescriptor.cs
index f33d6a37a..f91c13fdb 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/MaterialDescriptor.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/MaterialDescriptor.cs
@@ -5,18 +5,44 @@ using UnityEngine;
 
 namespace UniGLTF
 {
+    /// <summary>
+    /// Material information generated by IMaterialDescriptorGenerator
+    /// In recent versions, it is easy to manipulate Materials directly using Actions.
+    /// 
+    /// Actions の使用例は UniGLTF.UrpGltfMaterialDescriptorGenerator を参照
+    /// </summary>
     public sealed class MaterialDescriptor
     {
         public delegate Task MaterialGenerateAsyncFunc(Material m, GetTextureAsyncFunc getTexture, IAwaitCaller awaitCaller);
 
+        /// <summary>
+        /// <code>
+        /// material.name = matDesc.SubAssetKey.Name;
+        /// </code>
+        /// </summary>
         public readonly string Name;
+
+        /// <summary>
+        /// <code>
+        /// material = new Material(matDesc.Shader);
+        /// </summary>
         public readonly Shader Shader;
+
         public readonly int? RenderQueue;
         public readonly IReadOnlyDictionary<string, TextureDescriptor> TextureSlots;
         public readonly IReadOnlyDictionary<string, float> FloatValues;
         public readonly IReadOnlyDictionary<string, Color> Colors;
         public readonly IReadOnlyDictionary<string, Vector4> Vectors;
+
+        /// <summary>
+        /// Process and construct the argument Material
+        /// <code>
+        /// material.SetTexture(prop, texture);
+        /// material.SetColor(prop, color);
+        /// </code>
+        /// </summary>
         public readonly IReadOnlyList<Action<Material>> Actions;
+
         public readonly IReadOnlyList<MaterialGenerateAsyncFunc> AsyncActions;
 
         public SubAssetKey SubAssetKey => new SubAssetKey(SubAssetKey.MaterialType, Name);