README.md in fluent-plugin-string-scrub-0.0.4 vs README.md in fluent-plugin-string-scrub-0.1.0

@@ -49,9 +49,29 @@
 <match scrubbed.**>
   type stdout
 </match>
 ```
 
+## Filter plugin
+
+Fluentd >= v0.12 can use filter plugin.
+
+```
+<source>
+  type forward
+</source>
+
+<filter **>
+  type string_scrub
+  replace_char ?
+</filter>
+
+<match **>
+  type stdout
+</match>
+```
+
+
 ## Contributing
 
 1. Fork it ( https://github.com/[my-github-username]/fluent-plugin-string-scrub/fork )
 2. Create your feature branch (`git checkout -b my-new-feature`)
 3. Commit your changes (`git commit -am 'Add some feature'`)