diff --git a/README.md b/README.md
index 9e49456f71..a52ac2582c 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,11 @@ See
 [opam](https://github.com/ocsigen/js_of_ocaml/blob/master/js_of_ocaml-compiler.opam)
 file for version constraints.
 
+## Supported engines
+
+The generated code works with Node.js 16 or any recent web-browser compatible with ECMAScript 6.
+We optionally rely on js `WeakRef`, which is part of ECMAScript 2021, to implement `Stdlib.Weak` and `Stdlib.Ephemeron`.
+
 ### Toplevel requirements
 
 - tyxml, reactiveData
diff --git a/README_wasm_of_ocaml.md b/README_wasm_of_ocaml.md
index ee5c69df18..256ff4045b 100644
--- a/README_wasm_of_ocaml.md
+++ b/README_wasm_of_ocaml.md
@@ -4,7 +4,7 @@ Wasm_of_ocaml is a fork of Js_of_ocaml which compiles OCaml bytecode to WebAssem
 
 ## Supported engines
 
-The generated code works with Chrome 11.9, Node.js 22 and Firefox 122 (or more recent versions of these applications).
+The generated code works with Chrome 119, Node.js 22 and Firefox 122 (or more recent versions of these applications).
 
 In particular, the output code requires the following [Wasm extensions](https://webassembly.org/roadmap/) to run:
 - [the GC extension](https://github.com/WebAssembly/gc), including functional references and 31-bit integers