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Update index.md (#4025) 

* Update index.md

* Tweaks to EF error blurb
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Rick Anderson 2017-08-18 12:43:14 -04:00 committed by GitHub
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aspnetcore/migration/1x-to-2x/index.md
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@ -93,7 +93,11 @@ In 2.0 projects, the `Main` method of *Program.cs* has been simplified:
[!code-csharp[Main](../1x-to-2x/samples/AspNetCoreDotNetCore2.0App/AspNetCoreDotNetCore2.0App/Program.cs?highlight=8-11)]
The adoption of this new 2.0 pattern is highly recommended and is required in order for product features like [Entity Framework Core Migrations](xref:data/ef-mvc/migrations) to work.
The adoption of this new 2.0 pattern is highly recommended and is required for product features like [Entity Framework Core Migrations](xref:data/ef-mvc/migrations) to work. For example, running `Update-Database` from the Package Manager Console window or `dotnet ef database update` from the command line (on projects converted to ASP.NET Core 2.0) generates the following error:
```
Unable to create an object of type '<Context>'. Add an implementation of 'IDesignTimeDbContextFactory<Context>' to the project, or see https://go.microsoft.com/fwlink/?linkid=851728 for additional patterns supported at design time.
```
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