diff --git a/README.md b/README.md
index c88c8b6..4ff7441 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,15 @@ Or install it yourself as:
 
     $ gem install rails_big_brother
 
+## Configuration
+
+```ruby
+RailsBigBrother.config do |config|
+  config.format = "big_brother;%<user>s;%<controller_info>s;%<class>s;%<id>s;%<action>s;%<args>s"
+  config.logger = Rails.logger
+end
+```
+
 ## Usage
 
 Simply add this line in the model you want to log :
@@ -23,18 +32,6 @@ Simply add this line in the model you want to log :
 big_brother_watch
 ```
 
-### Define log format
-
-The default log format is :
-```ruby
-"%<big_brother>s;%<user>s;%<controller_info>s;%<class>s;%<id>s;%<action>s;%<args>s"
-```
-
-To define a new format, add this in an initializer :
-```ruby
-RailsBigBrother.format = "new_format"
-```
-
 ### User and controller info
 
 To fill user and controller info, you need to define two methods in your `ApplicationController`
diff --git a/lib/rails_big_brother.rb b/lib/rails_big_brother.rb
index 1ff3826..9b72993 100644
--- a/lib/rails_big_brother.rb
+++ b/lib/rails_big_brother.rb
@@ -3,48 +3,54 @@ require "rails_big_brother/controller"
 require "rails_big_brother/model"
 
 module RailsBigBrother
-  def format=(value)
-    @format = value
-  end
+  class << self
+    attr_writer :format, :logger
 
-  def format
-    @format ||= "%<big_brother>s;%<user>s;%<controller_info>s;%<class>s;%<id>s;%<action>s;%<args>s"
-  end
+    def logger
+      @logger ||= Rails.logger
+    end
 
-  def user=(value)
-    store[:user] = value
-  end
+    def format
+      @format ||= "big_brother;%<user>s;%<controller_info>s;%<class>s;%<id>s;%<action>s;%<args>s"
+    end
 
-  def user
-    store[:user]
-  end
+    def configure(&block)
+      yield(self) if block_given?
+    end
 
-  def controller_info=(value)
-    store[:controller_info] = value
-  end
+    def user=(value)
+      store[:user] = value
+    end
 
-  def controller_info
-    store[:controller_info]
-  end
+    def user
+      store[:user]
+    end
 
-  def controller_info_string
-    case controller_info
-    when Array
-      controller_info.join(',')
-    when Hash
-      controller_info.map { |k,v| "#{k}:#{v}" }.join(',')
-    else
-      controller_info
+    def controller_info=(value)
+      store[:controller_info] = value
+    end
+
+    def controller_info
+      store[:controller_info]
+    end
+
+    def controller_info_string
+      case controller_info
+      when Array
+        controller_info.join(',')
+      when Hash
+        controller_info.map { |k,v| "#{k}:#{v}" }.join(',')
+      else
+        controller_info
+      end
+    end
+
+    private
+
+    def store
+      Thread.current[:big_brother_log] ||= {}
     end
   end
-
-  private
-
-  def store
-    Thread.current[:big_brother_log] ||= {}
-  end
-
-  extend self
 end
 
 ActiveSupport.on_load(:active_record) do
diff --git a/lib/rails_big_brother/model.rb b/lib/rails_big_brother/model.rb
index 22d7d08..0892789 100644
--- a/lib/rails_big_brother/model.rb
+++ b/lib/rails_big_brother/model.rb
@@ -48,9 +48,8 @@ module RailsBigBrother
       end
 
       def big_brother_log(action, *args)
-        Rails.logger.info RailsBigBrother.format %
+        RailsBigBrother.logger.info RailsBigBrother.format %
         {
-          big_brother: "big_brother",
           user: RailsBigBrother.user,
           controller_info: RailsBigBrother.controller_info_string,
           class: self.class.name,