diff --git a/README.md b/README.md
index 1ce5cfe..5cecfa7 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,34 @@
 # bunker
-simple bastion system for linux hosts
+
+A simple bastion system for linux hosts
+
+## Installation
+
+### From Binary
+
+Visit [GitHub Releases](https://github.com/yankeguo/bunker/releases) and download the latest release.
+
+Static assets are embedded in the binary, so you don't need to download anything else.
+
+- Prepare a `data` directory and put `bunker.yaml` configuration file in it
+- Run `bunker -data-dir data`
+
+### From Container Image
+
+Visit [DockerHub Repository](https://hub.docker.com/repository/docker/yankeguo/bunker) or [GitHub Packages](https://github.com/yankeguo?tab=packages&repo_name=bunker) for container images
+
+- Prepare a `data` directory and put `bunker.yaml` configuration file in it
+- Run contaienr image with `/data` mounted, `docker run -p 8080:8080 -p 8022:8022 -v $PWD/data:/data yankeguo/bunker:latest`
+
+## Configuration File
+
+```yaml
+server:
+  listen: ":8080"
+ssh_server:
+  listen: ":8022"
+```
+
+## Credits
+
+GUO YANKE, MIT License
diff --git a/main.go b/main.go
index 56876cb..f525644 100644
--- a/main.go
+++ b/main.go
@@ -1,11 +1,13 @@
 package main
 
 import (
+	"flag"
 	"io/fs"
 	"log"
 	"net/http"
 	"os"
 	"path"
+	"path/filepath"
 
 	"github.com/yankeguo/rg"
 	"github.com/yankeguo/ufx"
@@ -18,8 +20,13 @@ func installStatic(ur ufx.Router) {
 }
 
 func main() {
+	var optDataDir string
+
+	flag.StringVar(&optDataDir, "data-dir", "", "data directory")
+	flag.Parse()
+
 	app := fx.New(
-		ufx.ProvideConfFromYAMLFile("bunker.yaml"),
+		ufx.ProvideConfFromYAMLFile(filepath.Join(optDataDir, "bunker.yaml")),
 		ufx.Module,
 		fx.Invoke(installStatic),
 	)