diff --git a/README.md b/README.md
index 22ea330..79434cd 100644
--- a/README.md
+++ b/README.md
@@ -16,11 +16,13 @@ a library or application, either by hand or via a ppx.
 ### 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))
+- [x] Tracy (see [ocaml-tracy](https://github.com/imandra-ai/ocaml-tracy), more specifically `tracy-client.trace`)
+- [x] Opentelemetry (see [ocaml-opentelemetry](https://github.com/imandra-ai/ocaml-opentelemetry/), in `opentelemetry.trace`)
 - [ ] landmarks?
 - [ ] Logs (only for messages, obviously)