Update README.md

README.md

@@ -14,7 +14,7 @@ The bitwarden mobile application is written in C# with Xamarin Android, Xamarin
 - [Visual Studio w/ Xamarin -or- Xamarin Studio](https://store.xamarin.com/)
 
 By default the app is targeting the production API. If you are running the [Core](https://github.com/bitwarden/core) API locally,
-you'll need to switch the extension to target your local API. Open `src/App/Utilities/ApiHttpClient.cs` and set `BaseAddress` to your local
+you'll need to switch the app to target your local API. Open `src/App/Utilities/ApiHttpClient.cs` and set `BaseAddress` to your local
 API instance (ex. `new Uri("http://localhost:4000")`).
 
 After restoring the nuget packages, you can now build and run the app.