diff --git a/manual/config/README.md b/manual/config/README.md
index 00bf40ac6..9f75d227b 100644
--- a/manual/config/README.md
+++ b/manual/config/README.md
@@ -4,6 +4,7 @@
 
 There are three config files in the community edition:
 
+* [environment variables](env.md): contains the components and environment variables settings of Seafile-docker instance
 * [ccnet.conf](ccnet-conf.md): contains the LDAP settings
 * [seafile.conf](seafile-conf.md): contains settings for seafile daemon and fileserver.
 * [seahub_settings.py](seahub_settings_py.md): contains settings for Seahub
diff --git a/manual/config/env.md b/manual/config/env.md
new file mode 100644
index 000000000..10f168b6b
--- /dev/null
+++ b/manual/config/env.md
@@ -0,0 +1,88 @@
+# .env
+
+The `.env` file will be used to specify the components used by the Seafile-docker instance and the environment variables required by each component. The default contents list in below
+
+```shell
+COMPOSE_FILE='seafile-server.yml,caddy.yml'
+COMPOSE_PATH_SEPARATOR=','
+
+
+SEAFILE_IMAGE=docker.seadrive.org/seafileltd/seafile-pro-mc:12.0-latest
+SEAFILE_DB_IMAGE=mariadb:10.11
+SEAFILE_MEMCACHED_IMAGE=memcached:1.6.29
+SEAFILE_ELASTICSEARCH_IMAGE=elasticsearch:8.15.0 # pro edition only
+SEAFILE_CADDY_IMAGE=lucaslorentz/caddy-docker-proxy:2.9
+
+SEAFILE_VOLUME=/opt/seafile-data
+SEAFILE_MYSQL_VOLUME=/opt/seafile-mysql/db
+SEAFILE_ELASTICSEARCH_VOLUME=/opt/seafile-elasticsearch/data # pro edition only
+SEAFILE_CADDY_VOLUME=/opt/seafile-caddy
+
+SEAFILE_MYSQL_DB_HOST=db
+SEAFILE_MYSQL_ROOT_PASSWORD=ROOT_PASSWORD
+SEAFILE_MYSQL_DB_USER=seafile
+SEAFILE_MYSQL_DB_PASSWORD=PASSWORD
+
+TIME_ZONE=Etc/UTC
+
+JWT_PRIVATE_KEY=
+
+SEAFILE_SERVER_HOSTNAME=example.seafile.com
+SEAFILE_SERVER_PROTOCOL=http
+
+SEAFILE_ADMIN_EMAIL=me@example.com
+SEAFILE_ADMIN_PASSWORD=asecret
+
+
+SEADOC_IMAGE=seafileltd/sdoc-server:1.0-latest
+SEADOC_VOLUME=/opt/seadoc-data
+
+ENABLE_SEADOC=false
+SEADOC_SERVER_URL=http://example.seafile.com/sdoc-server
+```
+
+## Seafile-docker configurations
+
+### Components configurations
+
+- `COMPOSE_FILE`: `.yml` files for components of [Seafile-docker](../docker/seafile_docker_overview.md), each `.yml` must be separated by the symbol defined in `COMPOSE_PATH_SEPARATOR`. The core components are involved in `seafile-server.yml` and `caddy.yml` which must be taken in this term.
+- `COMPOSE_PATH_SEPARATOR`: The symbol used to separate the `.yml` files in term `COMPOSE_FILE`, default is ','.
+
+### Docker images configurations
+
+- `SEAFILE_IMAGE`: The image of Seafile-server, default is `docker.seadrive.org/seafileltd/seafile-pro-mc:12.0-latest`.
+- `SEAFILE_DB_IMAGE`: Database server image, default is `mariadb:10.11`.
+- `SEAFILE_MEMCACHED_IMAGE`: Cached server image, default is `memcached:1.6.29`
+- `SEAFILE_ELASTICSEARCH_IMAGE`: Only valid in pro edition. The elasticsearch image, default is `elasticsearch:8.15.0`.
+- `SEAFILE_CADDY_IMAGE`: Caddy server image, default is `lucaslorentz/caddy-docker-proxy:2.9`.
+- `SEADOC_IMAGE`: Only valid after integrating [SeaDoc](../extra_setup/setup_seadoc.md). SeaDoc server image, default is `seafileltd/sdoc-server:1.0-latest`.
+
+### Persistent Volume Configurations
+
+- `SEAFILE_VOLUME`: The volume directory of Seafile data, default is `/opt/seafile-data`.
+- `SEAFILE_MYSQL_VOLUME`: The volume directory of MySQL data, default is `/opt/seafile-mysql/db`.
+- `SEAFILE_CADDY_VOLUME`: The volume directory of Caddy data used to store certificates obtained from Let's Encrypt's, default is `/opt/seafile-caddy`.
+- `SEAFILE_ELASTICSEARCH_VOLUME`: Only valid in pro edition. The volume directory of Elasticsearch data, default is `/opt/seafile-elasticsearch/data`.
+- `SEADOC_VOLUME`: Only valid after integrating [SeaDoc](../extra_setup/setup_seadoc.md). The volume directory of [SeaDoc server data](../extra_setup/setup_seadoc.md#seadoc-directory-structure), default is `/opt/seadoc-data`.
+
+## Mysql configurations
+
+- `SEAFILE_MYSQL_DB_HOST`: The host address of Mysql, default is the pre-defined service name `db` in Seafile-docker instance.
+- `SEAFILE_MYSQL_ROOT_PASSWORD`: The `root` password of MySQL.
+- `SEAFILE_MYSQL_DB_USER`: The user of MySQL (`database` - `user` can be found in `conf/seafile.conf`).
+- `SEAFILE_MYSQL_DB_PASSWORD`: The user `seafile` password of MySQL.
+
+## Seafile-server configurations
+
+- `SEAFILE_MYSQL_DB_PASSWORD`: The user `seafile` password of MySQL
+- `JWT`: JWT_PRIVATE_KEY, A random string with a length of no less than 32 characters, generate example: `pwgen -s 40 1`
+- `SEAFILE_SERVER_HOSTNAME`: Seafile server hostname or domain
+- `SEAFILE_SERVER_PROTOCOL`: Seafile server protocol (http or https)
+- `TIME_ZONE`: Time zone (default UTC)
+- `SEAFILE_ADMIN_EMAIL`: Admin username
+- `SEAFILE_ADMIN_PASSWORD`: Admin password
+
+## SeaDoc configurations (only valid after integrating SeaDoc)
+
+- `ENABLE_SEADOC`: Enable the SeaDoc server or not, default is `false`.
+- `SEADOC_SERVER_URL`: Only valid in `ENABLE_SEADOC=true`. Url of Seadoc server (e.g., http://example.seafile.com/sdoc-server).
diff --git a/manual/docker/pro-edition/deploy_seafile_pro_with_docker.md b/manual/docker/pro-edition/deploy_seafile_pro_with_docker.md
index 36bcc4dc7..ceabd9554 100644
--- a/manual/docker/pro-edition/deploy_seafile_pro_with_docker.md
+++ b/manual/docker/pro-edition/deploy_seafile_pro_with_docker.md
@@ -69,7 +69,7 @@ The following fields merit particular attention:
 - `SEAFILE_VOLUME`: The volume directory of Seafile data, default is `/opt/seafile-data`
 - `SEAFILE_MYSQL_VOLUME`: The volume directory of MySQL data, default is `/opt/seafile-mysql/db`
 - `SEAFILE_CADDY_VOLUME`: The volume directory of Caddy data used to store certificates obtained from Let's Encrypt's, default is `/opt/seafile-caddy`
-- `SEAFILE_ELASTICSEARCH_VOLUME`: The volume directory of Elasticsearch data
+- `SEAFILE_ELASTICSEARCH_VOLUME`: The volume directory of Elasticsearch data, default is `/opt/seafile-elasticsearch/data`
 - `SEAFILE_MYSQL_ROOT_PASSWORD`: The `root` password of MySQL
 - `SEAFILE_MYSQL_DB_USER`: The user of MySQL (`database` - `user` can be found in `conf/seafile.conf`)
 - `SEAFILE_MYSQL_DB_PASSWORD`: The user `seafile` password of MySQL
diff --git a/mkdocs.yml b/mkdocs.yml
index 41dfee1ec..0c71cff77 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -123,6 +123,7 @@ nav:
       - Config fail2ban: security/fail2ban.md
   - Configuration and Customization:
     - Outline: config/README.md
+    - Environment variables: config/env.md
     - ccnet.conf: config/ccnet-conf.md
     - seafile.conf: config/seafile-conf.md
     - seahub_settings.py: config/seahub_settings_py.md