diff --git a/cli_sample/bin/cli_sample.dart b/cli_sample/bin/cli_sample.dart
index 06176a3..d6f8867 100644
--- a/cli_sample/bin/cli_sample.dart
+++ b/cli_sample/bin/cli_sample.dart
@@ -1,5 +1,6 @@
 import 'package:cli_sample/cli_sample.dart' as cli_sample;
 
 void main(List<String> arguments) {
-  print('Hello world: ${cli_sample.calculate()}!');
+  final caculate_result = cli_sample.calculate();
+  print('Hello world: ${caculate_result}!');
 }
diff --git a/cli_sample/justfile b/cli_sample/justfile
new file mode 100644
index 0000000..864f1a4
--- /dev/null
+++ b/cli_sample/justfile
@@ -0,0 +1,10 @@
+_:
+  @just --list
+
+# run
+run:
+  dart run
+
+# compile
+compile:
+  dart compile exe bin/cli_sample.dart