diff --git a/CHANGES.md b/CHANGES.md
index 77a4dd0..1e39398 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,4 +1,14 @@
 
+# 0.6
+
+- add `ppx_trace` for easier instrumentation.
+  * `let%trace span = "foo" in …` will enter a scope `span` named "foo"
+  * `let%trace () = "foo" in …` will enter a scope named "foo" with a hidden name
+- add `trace-fuchsia` backend, which produces traces in the binary format
+    of [fuchsia](https://fuchsia.dev/fuchsia-src/reference/tracing/trace-format).
+    These traces are reasonably efficient to produce (~60ns per span on my machines)
+    and reasonably compact on disk, at least compared to the TEF backend.
+
 # 0.5
 
 - perf: reduce overhead in trace-tef
diff --git a/README.md b/README.md
index 8657920..a7e030d 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 This small library provides basic types that can be used to instrument
 a library or application, either by hand or via a ppx.
 
-### Features
+## Features
 
 - [x] spans
 - [x] messages
@@ -14,7 +14,7 @@ a library or application, either by hand or via a ppx.
 - [ ] other metrics?
 - [x] ppx to help instrumentation
 
-### Usage
+## Usage
 
 To instrument your code, you can simply add `trace` to your dune/opam files, and then
 write code like such:
@@ -138,13 +138,15 @@ In your `library` or `executable` stanza, add: `(preprocess (pps ppx_trace))`.
 The dependency on `trace.core` is automatically added. You still need to
 configure a backend to actually do collection.
 
-### Backends
+## Backends
 
 Concrete tracing or observability formats such as:
 
-- [ ] Fuchsia (see [tracing](https://github.com/janestreet/tracing))
+- [x] Fuchsia (see [the spec](https://fuchsia.dev/fuchsia-src/reference/tracing/trace-format) and [tracing](https://github.com/janestreet/tracing).
+        Can be opened in https://ui.perfetto.dev)
 - Catapult
-  * [x] light bindings here with `trace-tef`
+  * [x] light bindings here with `trace-tef`.
+        (Can be opened in https://ui.perfetto.dev)
   * [ ] richer bindings with [ocaml-catapult](https://github.com/imandra-ai/catapult),
         with multi-process backends, etc.
 - [x] Tracy (see [ocaml-tracy](https://github.com/imandra-ai/ocaml-tracy), more specifically `tracy-client.trace`)
diff --git a/dune-project b/dune-project
index 0c7e4d7..2f201d5 100644
--- a/dune-project
+++ b/dune-project
@@ -2,7 +2,7 @@
 
 (name trace)
 (generate_opam_files true)
-(version 0.5)
+(version 0.6)
 
 (source
  (github c-cube/ocaml-trace))
@@ -23,7 +23,7 @@
 
 (package
  (name ppx_trace)
- (synopsis "ppx-based instrumentation for trace")
+ (synopsis "A ppx-based preprocessor for trace")
  (depends
    (ocaml (>= 4.12)) ; we use __FUNCTION__
    ppxlib
diff --git a/ppx_trace.opam b/ppx_trace.opam
index b00d78c..e2a07ca 100644
--- a/ppx_trace.opam
+++ b/ppx_trace.opam
@@ -1,7 +1,7 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.5"
-synopsis: "ppx-based instrumentation for trace"
+version: "0.6"
+synopsis: "A ppx-based preprocessor for trace"
 maintainer: ["Simon Cruanes"]
 authors: ["Simon Cruanes"]
 license: "MIT"
diff --git a/trace-fuchsia.opam b/trace-fuchsia.opam
index 62ef782..ab6e675 100644
--- a/trace-fuchsia.opam
+++ b/trace-fuchsia.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.5"
+version: "0.6"
 synopsis:
   "A high-performance backend for trace, emitting a Fuchsia trace into a file"
 maintainer: ["Simon Cruanes"]
diff --git a/trace-tef.opam b/trace-tef.opam
index d984efa..cb35b41 100644
--- a/trace-tef.opam
+++ b/trace-tef.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.5"
+version: "0.6"
 synopsis:
   "A simple backend for trace, emitting Catapult/TEF JSON into a file"
 maintainer: ["Simon Cruanes"]
diff --git a/trace.opam b/trace.opam
index c68d219..dc5b41b 100644
--- a/trace.opam
+++ b/trace.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.5"
+version: "0.6"
 synopsis:
   "A stub for tracing/observability, agnostic in how data is collected"
 maintainer: ["Simon Cruanes"]