diff --git a/contrib/README.md b/contrib/README.md
index 4cb89df..ab20f71 100644
--- a/contrib/README.md
+++ b/contrib/README.md
@@ -203,7 +203,7 @@ If you run opencode inside a long-lived container like [opencode-devbox](https:/
 Preconditions:
 
 - **Long-lived container.** `docker compose up -d` with `restart: unless-stopped` (or equivalent). If the container is ephemeral (per-invocation), this pattern doesn't apply.
-- **`mempalace-session` is already installed inside the container.** opencode-devbox bakes it in via `mempalace-toolkit`, so a running devbox already satisfies this.
+- **`mempalace-session` is already installed inside the container.** opencode-devbox bakes it in from `v1.14.30b` onward (see the [`INSTALL_MEMPALACE_TOOLKIT`](https://gitea.jordbo.se/joakimp/opencode-devbox#build-args) arg). For earlier images or custom containers without the toolkit installed, run `./install.sh --yes` from a `mempalace-toolkit` checkout inside the container first — the installer is idempotent and safe to re-run. Note that a manual install lives in the container's ephemeral layer and is lost on `docker compose up --force-recreate`, so the bake-in approach is the durable solution.
 - **Host user can talk to docker.** Member of the `docker` group on Linux, or Docker Desktop running under the current login session on macOS.
 - **Canonical container name is `opencode-devbox`.** If you renamed it via `container_name:` or docker-compose project naming, adjust `CONTAINER` in the template.