diff --git a/generation/WinSDK/manual/Metadata.cs b/generation/WinSDK/manual/Metadata.cs
index 507596165..33e26afe2 100644
--- a/generation/WinSDK/manual/Metadata.cs
+++ b/generation/WinSDK/manual/Metadata.cs
@@ -157,6 +157,14 @@ public MetadataTypedefAttribute()
     }
 }
 
+[AttributeUsage(AttributeTargets.Struct | AttributeTargets.Enum | AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.ReturnValue, AllowMultiple = true, Inherited = false)]
+public class NativeAnnotationAttribute : Attribute
+{
+    public NativeAnnotationAttribute(string annotation)
+    {
+    }
+}
+
 public class NativeArrayInfoAttribute : Attribute
 {
     //
@@ -342,4 +350,4 @@ public class UnicodeAttribute : Attribute
     public UnicodeAttribute()
     {
     }
-}
\ No newline at end of file
+}