diff --git a/.gitignore b/.gitignore
index c245b2e49..27f4642ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,6 +31,7 @@ bard.json
 !.pre-commit-config.yaml
 !components.yaml
 !/docker-compose.yaml
+docker/data
 data/labels/instance_id.json
 .DS_Store
 /data
diff --git a/docker/docker-compose.yaml b/docker/docker-compose.yaml
index fe1aecba0..cf74c6711 100644
--- a/docker/docker-compose.yaml
+++ b/docker/docker-compose.yaml
@@ -1,7 +1,5 @@
 # Docker Compose configuration for LangBot
 # For Kubernetes deployment, see kubernetes.yaml and the deployment guide at https://langbot.app/docs
-version: "3"
-
 services:
 
   langbot_plugin_runtime:
@@ -16,6 +14,10 @@ services:
       - ./data/plugin-runtime:/app/data/plugin-runtime
     ports:
       - 5401:5401
+      # ACP Agent Runner daemon hub. With `daemon-enabled = true` in the plugin
+      # config, a user-side runner daemon behind NAT connects outward to
+      # ws://<langbot-public-host>:8766. Harmless when the hub is disabled.
+      - 8766:8766
     restart: on-failure
     environment:
       - TZ=Asia/Shanghai