Update README.md

README.md

@@ -114,7 +114,7 @@ In your host application you can create two fake providers:
 - [FakeInstantMessaging](https://github.com/DentallApp/back-end/blob/dev/src/Infrastructure/Services/FakeInstantMessaging.cs) 
 
 Since the host application does not have a direct reference to these plugins, it can load them dynamically. 
-Therefore, if the host application does not load these two plugins, [it may decide to use a fake provider as a console logger.](https://github.com/DentallApp/back-end/blob/24c2b30761daf10f34d5865c62a1b17827bc22ef/src/HostApplication/PluginStartup.cs#L24-L26) 
+Therefore, if the host application does not load these two plugins, [it may decide to use a fake provider as a console logger.](https://github.com/DentallApp/back-end/blob/d89dde8c91d6e6d17698f0cc3315137cfa81e662/src/HostApplication/PluginStartup.cs#L17-L19) 
 
 Thanks to the plugin-based architecture, you can easily swap modules without having to make any changes to the host application.
 
@@ -357,6 +357,8 @@ The [TypeFinder](https://mrdave1999.github.io/CPlugin.Net/api/CPlugin.Net.TypeFi
 See this thread for more information: [Add support for dependency injection via constructor](https://github.com/MrDave1999/CPlugin.Net/issues/32)
 
 **Example:**
+
+The extension method called [AddSubtypesOf](https://mrdave1999.github.io/CPlugin.Net/api/CPlugin.Net.CPluginServiceCollectionExtensions.html) must be invoked before loading the plugins.
 ```cs
 var configurationRoot = new ConfigurationBuilder()
     .AddJsonFile("./appsettings.json")