diff --git a/src/c#/GeneralUpdate.Core/Configuration/AbstractBootstrap.cs b/src/c#/GeneralUpdate.Core/Configuration/AbstractBootstrap.cs
index 0d872b72..c64d9c22 100644
--- a/src/c#/GeneralUpdate.Core/Configuration/AbstractBootstrap.cs
+++ b/src/c#/GeneralUpdate.Core/Configuration/AbstractBootstrap.cs
@@ -85,8 +85,13 @@ protected T GetOption<T>(UpdateOption<T>? option)
         public TBootstrap DownloadOrchestrator<T>() where T : Download.Abstractions.IDownloadOrchestrator, new()
         { _extensions[typeof(Download.Abstractions.IDownloadOrchestrator)] = typeof(T); return (TBootstrap)this; }
 
-        // ICleanStrategy / IDirtyStrategy extension points are in GeneralUpdate.Differential.
-        // Add via external extension methods once the project reference is established.
+        /// <summary>Register a custom clean strategy by type name (interface lives in GeneralUpdate.Differential).</summary>
+        public TBootstrap CleanStrategy<T>() where T : class, new()
+        { _extensions[typeof(T)] = typeof(T); return (TBootstrap)this; }
+
+        /// <summary>Register a custom dirty strategy by type name (interface lives in GeneralUpdate.Differential).</summary>
+        public TBootstrap DirtyStrategy<T>() where T : class, new()
+        { _extensions[typeof(T)] = typeof(T); return (TBootstrap)this; }
 
         public TBootstrap ConfigureBlackList(BlackListConfig config)
         {
diff --git a/src/c#/GeneralUpdate.Core/GeneralUpdate.Core.csproj b/src/c#/GeneralUpdate.Core/GeneralUpdate.Core.csproj
index b2985972..61fa96bc 100644
--- a/src/c#/GeneralUpdate.Core/GeneralUpdate.Core.csproj
+++ b/src/c#/GeneralUpdate.Core/GeneralUpdate.Core.csproj
@@ -34,7 +34,8 @@
     </ItemGroup>
 
     <ItemGroup>
-        <!-- DrivelutionMiddleware: requires net10.0 target + Drivelution reference -->
+        <!-- DrivelutionMiddleware: available for users who add GeneralUpdate.Drivelution reference.
+             Restore by: 1) Add <ProjectReference> to Drivelution, 2) Remove this Compile Remove -->
         <Compile Remove="Pipeline\DrivelutionMiddleware.cs" />
         <!-- IsExternalInit is built-in for net8.0+ (C# 9 records) -->
         <Compile Remove="Configuration\IsExternalInit.cs" Condition="'$(TargetFramework)' != 'netstandard2.0'" />
diff --git a/src/c#/GeneralUpdate.Core/Strategy/LinuxStrategy.cs b/src/c#/GeneralUpdate.Core/Strategy/LinuxStrategy.cs
index 19fbec74..e9791a96 100644
--- a/src/c#/GeneralUpdate.Core/Strategy/LinuxStrategy.cs
+++ b/src/c#/GeneralUpdate.Core/Strategy/LinuxStrategy.cs
@@ -36,8 +36,7 @@ protected override PipelineBuilder BuildPipeline(PipelineContext context)
             .UseMiddlewareIf<PatchMiddleware>(_configinfo.PatchEnabled)
             .UseMiddleware<CompressMiddleware>()
             .UseMiddleware<HashMiddleware>();
-        // DrivelutionMiddleware requires GeneralUpdate.Drivelution project reference;
-        // uncomment when the reference is added for net10.0 target.
+        // DrivelutionMiddleware: add GeneralUpdate.Drivelution project reference to enable
         return builder;
     }
 
diff --git a/src/c#/GeneralUpdate.Core/Strategy/WindowsStrategy.cs b/src/c#/GeneralUpdate.Core/Strategy/WindowsStrategy.cs
index 49f3b823..ac3b4f9f 100644
--- a/src/c#/GeneralUpdate.Core/Strategy/WindowsStrategy.cs
+++ b/src/c#/GeneralUpdate.Core/Strategy/WindowsStrategy.cs
@@ -38,8 +38,7 @@ protected override PipelineBuilder BuildPipeline(PipelineContext context)
                 .UseMiddlewareIf<PatchMiddleware>(_configinfo.PatchEnabled)
                 .UseMiddleware<CompressMiddleware>()
                 .UseMiddleware<HashMiddleware>();
-            // DrivelutionMiddleware requires GeneralUpdate.Drivelution project reference;
-            // uncomment when the reference is added for net10.0 target.
+            // DrivelutionMiddleware: add GeneralUpdate.Drivelution project reference to enable
             return builder;
         }