diff --git a/README.md b/README.md
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+# Fluent logger
+A structured event loger
+
+## Examples
+
+### Simple
+
+```ruby
+require 'fluent-logger'
+
+log = Fluent::Logger::FluentLogger.new(nil, :host=>'localhost', :port=>24224)
+unless log.post("myapp.access", {"agent"=>"foo"})
+  p log.last_error # You can get last error object via last_error method
+end
+
+# output: myapp.access {"agent":"foo"}
+```
+
+### Singleton
+```ruby
+require 'fluent-logger'
+
+Fluent::Logger::FluentLogger.open(nil, :host=>'localhost', :port=>24224)
+Fluent::Logger.post("myapp.access", {"agent"=>"foo"})
+
+# output: myapp.access {"agent":"foo"}
+```
+
+### Tag prefix
+```ruby
+require 'fluent-logger'
+
+log = Fluent::Logger::FluentLogger.new('myapp', :host=>'localhost', :port=>24224)
+log.post("access", {"agent"=>"foo"})
+
+# output: myapp.access {"agent":"foo"}
+```
+
+## Loggers
+
+### Fluent
+```ruby
+Fluent::Logger::FluentLogger.open('tag_prefix', :host=>'localhost', :port=24224)
+```
+
+### Console
+```ruby
+Fluent::Logger::ConsoleLogger.open(io)
+```
+
+### Null
+```ruby
+Fluent::Logger::NullLogger.open
+```
+
+|name|description|
+|---|---|
+|Web site|http://fluent.github.com/|
+|Documents|http://fluent.github.com/doc/|
+|Source repository|https://github.com/fluent/fluent-logger-ruby|
+|Author|Sadayuki Furuhashi|
+|Copyright|(c) 2011 FURUHASHI Sadayuki|
+|License|Apache License, Version 2.0|
diff --git a/README.rdoc b/README.rdoc
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-= Fluent logger
-
-A structured event loger
-
-== Examples
-
-=== Simple
-
-    require 'fluent-logger'
-    
-    log = Fluent::Logger::FluentLogger.new(nil, :host=>'localhost', :port=>24224)
-    unless log.post("myapp.access", {"agent"=>"foo"})
-      p log.last_error # You can get last error object via last_error method
-    end
-
-    # output: myapp.access {"agent":"foo"}
-
-=== Singleton
-
-    require 'fluent-logger'
-    
-    Fluent::Logger::FluentLogger.open(nil, :host=>'localhost', :port=>24224)
-    Fluent::Logger.post("myapp.access", {"agent"=>"foo"})
-    
-    # output: myapp.access {"agent":"foo"}
-
-=== Tag prefix
-
-    require 'fluent-logger'
-    
-    log = Fluent::Logger::FluentLogger.new('myapp', :host=>'localhost', :port=>24224)
-    log.post("access", {"agent"=>"foo"})
-    
-    # output: myapp.access {"agent":"foo"}
-
-== Loggers
-
-=== Fluent
-
-    Fluent::Logger::FluentLogger.open('tag_prefix', :host=>'localhost', :port=24224)
-
-=== Console
-
-    Fluent::Logger::ConsoleLogger.open(io)
-
-=== Null
-
-    Fluent::Logger::NullLogger.open
-
-
-Web site::  http://fluent.github.com/
-Documents:: http://fluent.github.com/doc/
-Source repository:: https://github.com/fluent/fluent-logger-ruby
-Author:: Sadayuki Furuhashi
-Copyright:: (c) 2011 FURUHASHI Sadayuki
-License:: Apache License, Version 2.0
-