README.md in fluent-plugin-add-0.0.3 vs README.md in fluent-plugin-add-0.0.4

@@ -1,15 +1,17 @@
-# fluent-plugin-add 
+# 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)
 
-
 ## Installation
 
 
     gem install fluent-plugin-add
 
 ## Configration
 
+### AddOutput
+
     <match test.**>
       type add
       add_tag_prefix debug
       <pair>
         hoge moge
@@ -21,9 +23,24 @@
 ### Assuming following inputs are coming:
     test.aa: {"json":"dayo"}
 ### then output bocomes as belows
     debug.test.aa: {"json":"dayo", "hoge":"moge","hogehoge":"mogemoge"}
 
+### AddFilter
+
+    <filter test.**>
+      type add
+      <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"}
 
 ## Contributing
 
 1. Fork it
 2. Create your feature branch (`git checkout -b my-new-feature`)