diff --git a/README.mdown b/README.mdown
index c051eb19..9d7e11ac 100644
--- a/README.mdown
+++ b/README.mdown
@@ -147,6 +147,7 @@ Formatters
 - _WildfireFormatter_: Used to format log records into the Wildfire/FirePHP protocol, only useful for the FirePHPHandler.
 - _ChromePHPFormatter_: Used to format log records into the ChromePHP format, only useful for the ChromePHPHandler.
 - _GelfFormatter_: Used to format log records into Gelf message instances, only useful for the GelfHandler.
+- _LogstashEventFormatter_: Used to format log records into [Logstash](http://logstash.net/) event json, useful for any handler listed under inputs [here](http://logstash.net/docs/1.1.1/).
 
 Processors
 ----------