diff --git a/AGENTS.md b/AGENTS.md
index a7f041f..59ea7a7 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -14,6 +14,7 @@
 - `./banger vm create --name testbox` creates and starts a VM.
 - `./banger vm ssh testbox` connects to a running guest.
 - `./banger vm stop testbox` stops a VM while preserving its disks.
+- `./banger vm stop vm-a vm-b vm-c` and `./banger vm set --nat web-1 web-2` are supported; multi-VM lifecycle and `set` actions fan out concurrently through the CLI.
 - `./banger tui` launches the terminal UI.
 - `make test` runs `go test ./...`.
 - `./verify.sh` runs the smoke test for the Go VM workflow.
@@ -27,6 +28,7 @@
 ## Testing Guidelines
 - Primary automated coverage is `go test ./...`.
 - Manual verification for VM lifecycle changes: `./banger vm create`, confirm SSH access, then stop/delete the VM.
+- Rebuilt images now include `mise` plus `opencode` by default; if you change guest provisioning, document whether users need to rebuild `./runtime/rootfs-docker.ext4` or another base image to pick it up.
 - If you add a new operational workflow, document how to exercise it in `README.md`.
 - For NAT changes, verify both guest outbound access and host rule cleanup, for example with `./verify.sh --nat`.
 
diff --git a/README.md b/README.md
index c5906f6..8cd1aa6 100644
--- a/README.md
+++ b/README.md
@@ -111,6 +111,14 @@ Update stopped VM settings:
 banger vm set calm-otter --memory 2048 --vcpu 4 --disk-size 32G
 ```
 
+Lifecycle and `set` actions also accept multiple VM refs and run them
+concurrently:
+```bash
+banger vm stop calm-otter buildbox api-1
+banger vm kill --signal KILL aa12bb34 cc56dd78
+banger vm set --nat web-1 web-2 web-3
+```
+
 Launch the TUI:
 ```bash
 banger tui
@@ -146,7 +154,7 @@ Useful config keys:
 - `firecracker_bin`
 - `ssh_key_path`
 - `namegen_path`
-- `customize_script`
+- `customize_script` (manual helper compatibility; `banger image build` is Go-native)
 - `default_rootfs`
 - `default_base_rootfs`
 - `default_kernel`
@@ -174,6 +182,10 @@ Build a managed image:
 banger image build --name docker-dev --docker
 ```
 
+Rebuilt images install a pinned `mise` at `/usr/local/bin/mise`, activate it
+for bash login and interactive shells, and install `opencode` through `mise`
+by default.
+
 Show or delete images:
 ```bash
 banger image show docker-dev
@@ -215,6 +227,12 @@ To rebuild the source-checkout default image in `./runtime/rootfs-docker.ext4`:
 make rootfs
 ```
 
+If your runtime bundle does not include `./runtime/rootfs.ext4`, pass an
+explicit base image instead:
+```bash
+./make-rootfs.sh --base-rootfs /path/to/base-rootfs.ext4
+```
+
 If the package manifest changed and you want a fresh source-checkout image:
 ```bash
 rm -f ./runtime/rootfs-docker.ext4 ./runtime/rootfs-docker.ext4.packages.sha256
@@ -223,6 +241,8 @@ make rootfs
 
 `make rootfs` expects a bootstrapped runtime bundle. If `./runtime/rootfs.ext4`
 is not available, pass an explicit `--base-rootfs` to `./make-rootfs.sh`.
+Existing VMs keep using their current image and disks; rebuilds only affect VMs
+created from the rebuilt image afterward.
 
 ## Maintaining The Runtime Bundle
 The checked-in [`runtime-bundle.toml`](/home/thales/projects/personal/banger/runtime-bundle.toml)