add a TODO
diff --git a/src/csharp/Grpc.Core/GrpcEnvironment.cs b/src/csharp/Grpc.Core/GrpcEnvironment.cs
index 0f7474c..a6a1d8a 100644
--- a/src/csharp/Grpc.Core/GrpcEnvironment.cs
+++ b/src/csharp/Grpc.Core/GrpcEnvironment.cs
@@ -434,6 +434,8 @@
// - .NET core doesn't run finalizers on shutdown, so there's no risk of getting
// a crash because grpc_*_destroy methods for native objects being invoked
// in wrong order.
+ // TODO(jtattermusch): Verify that the shutdown hooks are still not needed
+ // once we add support for new platforms using netstandard (e.g. Xamarin).
#else
// On desktop .NET framework and Mono, we need to register for a shutdown
// event to explicitly shutdown the GrpcEnvironment.