diff --git a/GUIDE.md b/GUIDE.md
new file mode 100644
index 0000000..4f53b51
--- /dev/null
+++ b/GUIDE.md
@@ -0,0 +1,38 @@
+# acmd guides
+
+## Flag
+Example with command like that `./dummy server ./openapi.yml -port=8080` from [dummy](https://github.com/go-dummy/dummy/blob/main/cmd/dummy/main.go)
+```go
+func run() error {
+	cmds := []acmd.Command{
+		{
+			// Command
+			Name:        "server",
+			Description: "run mock server",
+			Do: func(ctx context.Context, args []string) error {
+				cfg := config.NewConfig()
+                
+				// Argument ./openapi
+				cfg.Server.Path = args[0]
+                
+				// Flags after argument
+				fs := flag.NewFlagSet("dummy", flag.ContinueOnError)
+				fs.StringVar(&cfg.Server.Port, "port", "8080", "")
+				fs.StringVar(&cfg.Logger.Level, "logger-level", "INFO", "")
+				if err := fs.Parse(args[1:]); err != nil {
+					return err
+				}
+
+				...
+			},
+		},
+	}
+
+	r := acmd.RunnerOf(cmds, acmd.Config{
+		AppName: "Dummy",
+		Version: version,
+	})
+
+	return r.Run()
+}
+```
diff --git a/README.md b/README.md
index 0000dee..7fccf47 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,8 @@ Popular CLI libraries (or better frameworks) have too large and unclear API, in
 * Auto suggesting command.
 * Builtin `help` and `version` commands.
 
+See [GUIDE.md](https://github.com/cristalhq/acmd/blob/main/GUIDE.md) for more details
+
 ## Install
 
 Go version 1.17+