diff --git a/src/lib/a.rb b/src/lib/a.rb
index af88718..5a95104 100644
--- a/src/lib/a.rb
+++ b/src/lib/a.rb
@@ -1 +1 @@
-puts "a"
+# puts "a"
diff --git a/src/lib/b.rb b/src/lib/b.rb
index cf63f3c..08e5e68 100644
--- a/src/lib/b.rb
+++ b/src/lib/b.rb
@@ -1 +1 @@
-puts "b"
+# puts "b"
diff --git a/src/main.rb b/src/main.rb
index b9efd0a..440f2cb 100644
--- a/src/main.rb
+++ b/src/main.rb
@@ -1,3 +1,7 @@
-puts "hello world"
-
-puts OS.machine
+puts "===== Run Success ======"
+puts "Hello World"
+puts "Powered by mruby 3.0.0"
+puts "===== System Info ======"
+puts "Kernel: #{OS.sysname}-#{OS.machine}"
+puts "Bit: #{OS.bits}"
+puts "Posix: #{OS.posix?}"