diff --git a/doc/install/docker.md b/doc/install/docker.md
index d26b22f1..ff8ac583 100644
--- a/doc/install/docker.md
+++ b/doc/install/docker.md
@@ -18,13 +18,21 @@ Image: crazymax/diun:latest
    - linux/s390x
 ```
 
-Environment variables can be used within your container:
+## Environment variables
 
 * `TZ` : Timezone assigned
 * `LOG_LEVEL` : Log level output (default `info`)
 * `LOG_JSON`: Enable JSON logging output (default `false`)
 * `LOG_CALLER`: Enable to add file:line of the caller (default `false`)
 
+## Volumes
+
+* `/data` : Contains bbolt database which retains Docker images manifests
+
+> :warning: Note that the volume should be owned by uid `1000` and gid `1000`. If you don't give the volume correct permissions, the container may not start.
+
+## Usage
+
 Docker compose is the recommended way to run this image. Copy the content of folder [.res/compose](../../.res/compose) in `/opt/diun/` on your host for example. Edit the compose and config file with your preferences and run the following commands:
 
 ```