diff --git a/README.md b/README.md
index c78f877..4883a5e 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,21 @@
 This small library provides basic types that can be used to instrument
 a library or application, either by hand or via a ppx.
 
-Backends, using concrete tracing or observability formats such as:
-- Fuchsia (see [tracing](https://github.com/janestreet/tracing))
-- Catapult (see [ocaml-catapult](https://github.com/imandra-ai/catapult))
-- Tracy (see [ocaml-tracy](https://github.com/imandra-ai/ocaml-tracy))
+### Features
+
+- [x] spans
+- [x] messages
+- [ ] counters
+- [ ] other metrics?
+
+### Backends
+
+Concrete tracing or observability formats such as:
+- [ ] Fuchsia (see [tracing](https://github.com/janestreet/tracing))
+- Catapult
+  * [x] light bindings here with `trace-tef`
+  * [ ] richer bindings with [ocaml-catapult](https://github.com/imandra-ai/catapult),
+        with multi-process backends, etc.
+- [ ] Tracy (see [ocaml-tracy](https://github.com/imandra-ai/ocaml-tracy))
+- [ ] landmarks?
+- [ ] Logs (only for messages, obviously)