Update 1.md

Author: davidfowl

1.md

@@ -136,7 +136,7 @@ This will let me resolve `FooAndBar`, `IFoo` and `IBar` and it will give me the
 
 ## Creating instances of types from an IServiceProvider
 
-Usually you need to register a type in order to instantiate instances of a type from the DI container, somebody needs to call `IServiceProvider.GetService`. This means that the service needs to be registered in the container. There's a useful utility called [ActivatorUtilities](https://docs.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.activatorutilities?view=dotnet-plat-ext-5.0) that can be used as a factory for types that haven't been registered, but have dependencies that are registered in the DI container.
+Usually you need to register a type in order to instantiate instances of a type from the DI container, somebody needs to call `IServiceProvider.GetService`. This means that the service needs to be registered in the container. This may not be desirable if these types are discovered dynamically (like controllers in MVC). There's a useful utility called [ActivatorUtilities](https://docs.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.activatorutilities?view=dotnet-plat-ext-5.0) that can be used as a factory for types that haven't been registered, but have dependencies that are registered in the DI container.
 
 ```C#
 public class MyDependency