diff --git a/README.md b/README.md
index 08d9c52..4bb6eb8 100644
--- a/README.md
+++ b/README.md
@@ -19,3 +19,7 @@ please [open an issue](https://github.com/dart-lang/grpc-dart/issues).
 # Notes
 
 This library requires Dart SDK version 1.24.3 or later.
+
+It currently supports the the [Flutter](https://flutter.io/) and
+[VM/Server](https://www.dartlang.org/dart-vm) platforms. The potential
+addition of gRPC-Web is tracked in [issue 43](https://github.com/grpc/grpc-dart/issues/43).