README.md in fluent-plugin-add-0.0.4 vs README.md in fluent-plugin-add-0.0.5

@@ -1,8 +1,10 @@
 # fluent-plugin-add, a plugin for [Fluentd](http://fluentd.org) 
 [![Build Status](https://travis-ci.org/yu-yamada/fluent-plugin-add.svg?branch=master)](https://travis-ci.org/yu-yamada/fluent-plugin-add)
 
+[![Gem Version](https://badge.fury.io/rb/fluent-plugin-add.svg)](https://badge.fury.io/rb/fluent-plugin-add)
+
 ## Installation
 
 
     gem install fluent-plugin-add
 
@@ -11,36 +13,38 @@
 ### AddOutput
 
     <match test.**>
       type add
       add_tag_prefix debug
+      uuid true # optional 
       <pair>
         hoge moge
         hogehoge mogemoge
       </pair>
     </match>
 
 
 ### Assuming following inputs are coming:
     test.aa: {"json":"dayo"}
-### then output bocomes as belows
-    debug.test.aa: {"json":"dayo", "hoge":"moge","hogehoge":"mogemoge"}
+### then output becomes as belows
+    debug.test.aa: {"json":"dayo", "hoge":"moge","hogehoge":"mogemoge","uuid":"427037E7-235B-4F6C-9975-15AAC75E56C5"}
 
 ### AddFilter
 
     <filter test.**>
       type add
+      uuid true # optional 
       <pair>
         hoge moge
         hogehoge mogemoge
       </pair>
     </filter>
 
 
 ### Assuming following inputs are coming:
     test.aa: {"json":"dayo"}
 ### then output bocomes as belows
-    debug.test.aa: {"json":"dayo", "hoge":"moge","hogehoge":"mogemoge"}
+    debug.test.aa: {"json":"dayo", "hoge":"moge","hogehoge":"mogemoge","uuid":"427037E7-235B-4F6C-9975-15AAC75E56C5"}
 
 ## Contributing
 
 1. Fork it
 2. Create your feature branch (`git checkout -b my-new-feature`)