diff --git a/.cligen.yml b/.cligen.yml
index 5a0e12a..7dd47f0 100644
--- a/.cligen.yml
+++ b/.cligen.yml
@@ -1,4 +1,5 @@
 name: "Dummy"
 commands:
   - name: "server"
+    alias: "s"
     description: "run mock server"
diff --git a/README.md b/README.md
index aa3282a..134e0da 100644
--- a/README.md
+++ b/README.md
@@ -19,10 +19,10 @@ go install github.com/go-dummy/dummy/cmd/dummy@latest
 ## Usage
 Dummy can help you run mock server based off an API contract, which helps people see how your API will work before you even have it built. Run it locally with the `dummy server` command to run your API on a HTTP server you can interact with.
 ```shell
-dummy server ./openapi.yml
+dummy s openapi.yml
 ```
 ```shell
-dummy server https://raw.githubusercontent.com/go-dummy/dummy/main/examples/docker/openapi3.yml
+dummy s https://raw.githubusercontent.com/go-dummy/dummy/main/examples/docker/openapi.yml
 ```
 More usage [examples](examples)
 
diff --git a/cmd/dummy/main.go b/cmd/dummy/main.go
index 42ee55b..25f5593 100644
--- a/cmd/dummy/main.go
+++ b/cmd/dummy/main.go
@@ -32,6 +32,7 @@ func run() error {
 	cmds := []acmd.Command{
 		{
 			Name:        "server",
+			Alias:       "s",
 			Description: "run mock server",
 			Do: func(ctx context.Context, args []string) error {
 				cfg := config.NewConfig()
diff --git a/examples/README.md b/examples/README.md
new file mode 100644
index 0000000..23caccc
--- /dev/null
+++ b/examples/README.md
@@ -0,0 +1,13 @@
+## Usage
+```shell
+dummy s openapi.yml
+```
+```shell
+dummy server openapi.yml
+```
+```shell
+dummy s openapi.json
+```
+```shell
+dummy s https://raw.githubusercontent.com/go-dummy/dummy/main/examples/docker/openapi.yml
+```
diff --git a/examples/docker/Dockerfile b/examples/docker/Dockerfile
index e5110f4..2628141 100644
--- a/examples/docker/Dockerfile
+++ b/examples/docker/Dockerfile
@@ -6,4 +6,4 @@ COPY ./openapi3.yml .
 
 WORKDIR .
 
-CMD ["dummy", "server", "openapi3.yml", "-port=8080"]
+CMD ["dummy", "s", "openapi.yml", "-port=8080"]
diff --git a/examples/docker/openapi3.yml b/examples/docker/openapi.yml
similarity index 100%
rename from examples/docker/openapi3.yml
rename to examples/docker/openapi.yml