diff --git a/src/Scrutor/ClosedTypeDecorationStrategy.cs b/src/Scrutor/ClosedTypeDecorationStrategy.cs
index 06c5768..cb86a9d 100644
--- a/src/Scrutor/ClosedTypeDecorationStrategy.cs
+++ b/src/Scrutor/ClosedTypeDecorationStrategy.cs
@@ -28,6 +28,6 @@ public ClosedTypeDecorationStrategy(Type serviceType, Type? decoratorType, Func<
             return FactoryDecorator(serviceType, serviceKey, DecoratorFactory);
         }
 
-        throw new InvalidOperationException($"Both serviceType and decoratorFactory can not be null.");
+        throw new InvalidOperationException($"Both {nameof(DecoratorType)} and {nameof(DecoratorFactory)} can not be null.");
     }
 }
diff --git a/src/Scrutor/OpenGenericDecorationStrategy.cs b/src/Scrutor/OpenGenericDecorationStrategy.cs
index 62f014f..8d92855 100644
--- a/src/Scrutor/OpenGenericDecorationStrategy.cs
+++ b/src/Scrutor/OpenGenericDecorationStrategy.cs
@@ -35,6 +35,6 @@ public OpenGenericDecorationStrategy(Type serviceType, Type? decoratorType, Func
             return FactoryDecorator(serviceType, serviceKey, DecoratorFactory);
         }
 
-        throw new InvalidOperationException($"Both serviceType and decoratorFactory can not be null.");
+        throw new InvalidOperationException($"Both {nameof(DecoratorType)} and {nameof(DecoratorFactory)} can not be null.");
     }
 }