diff --git a/src/Schema/MobX/ObservableClass.ts b/src/Schema/MobX/ObservableClass.ts
index 3be882a..e723f12 100644
--- a/src/Schema/MobX/ObservableClass.ts
+++ b/src/Schema/MobX/ObservableClass.ts
@@ -24,3 +24,8 @@ export const ObservableClass = <Self extends ObservableClassSelf>(
             )
         }
     } as Self
+
+export const ObservableClassDual: {
+    <Self extends ObservableClassSelf>(options?: Omit<CreateObservableOptions, "proxy">): (self: Self) => Self
+    <Self extends ObservableClassSelf>(self: Self, options?: Omit<CreateObservableOptions, "proxy">): Self
+} = () => {}