README.md in yuuki-0.1.0 vs README.md in yuuki-0.1.1

@@ -18,10 +18,31 @@
 
     $ gem install yuuki
 
 ## Usage
 
-あとで書く。
+```ruby
+class HogeClass
+  add :a
+  def a
+    puts 'a'
+  end
+
+  add :b
+  tag :b, :tag_b
+  def b
+    puts 'b'
+  end
+end
+
+yuuki = Yuuki::Caller.new(HogeClass)
+yuuki.run
+# a
+# b
+
+yuuki.run_tag(:tag_b)
+# b
+```
 
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at [https://github.com/ishotihadus/yuuki](https://github.com/ishotihadus/yuuki).