diff --git a/app/controllers/fluentd/settings/out_forward_controller.rb b/app/controllers/fluentd/settings/out_forward_controller.rb
index f449a31..f9f6cb4 100644
--- a/app/controllers/fluentd/settings/out_forward_controller.rb
+++ b/app/controllers/fluentd/settings/out_forward_controller.rb
@@ -4,6 +4,11 @@ class Fluentd::Settings::OutForwardController < ApplicationController
 
   def show
     @setting = Fluentd::Setting::OutForward.new({
+      secondary: {
+        "0" => {
+          type: "file",
+        }
+      }
     })
   end
 
@@ -27,7 +32,10 @@ class Fluentd::Settings::OutForwardController < ApplicationController
 
   def setting_params
     params.require(:fluentd_setting_out_forward).permit(*Fluentd::Setting::OutForward::KEYS).merge(
-      params.require(:fluentd_setting_out_forward).permit(:server => Fluentd::Setting::OutForward::Server::KEYS)
+      params.require(:fluentd_setting_out_forward).permit(
+        :server => Fluentd::Setting::OutForward::Server::KEYS,
+        :secondary => Fluentd::Setting::OutForward::Secondary::KEYS,
+      ),
     )
   end
 
diff --git a/app/helpers/settings_helper.rb b/app/helpers/settings_helper.rb
index b13dd67..773f558 100644
--- a/app/helpers/settings_helper.rb
+++ b/app/helpers/settings_helper.rb
@@ -3,6 +3,8 @@ module SettingsHelper
     html = '<div class="form-group">'
 
     case form.object.column_type(key)
+    when :hidden
+      return form.hidden_field(key)
     when :boolean, :flag
       html << form.check_box(key, {}, "true", "false")
       html << " " # NOTE: Adding space for padding
diff --git a/app/models/fluentd/setting/common.rb b/app/models/fluentd/setting/common.rb
index d89e3a4..d1f883f 100644
--- a/app/models/fluentd/setting/common.rb
+++ b/app/models/fluentd/setting/common.rb
@@ -5,7 +5,7 @@ class Fluentd
       include ActiveModel::Model
 
       module ClassMethods
-        attr_accessor :values, :types, :children
+        attr_accessor :values, :types, :children, :hidden_values
 
         def choice(key, values)
           @values ||= {}
@@ -13,6 +13,10 @@ class Fluentd
           set_type(:choice, [key])
         end
 
+        def hidden(key)
+          set_type(:hidden, [key])
+        end
+
         def nested(key, klass, options = {})
           # e.g.:
           #  <match>
@@ -92,7 +96,7 @@ class Fluentd
               "\n" + child_instance.to_config(key).gsub(/^/m, "  ")
             end
           end.join
-        else
+        else # including :hidden
           print_if_present(key)
         end
       end
diff --git a/app/models/fluentd/setting/out_forward.rb b/app/models/fluentd/setting/out_forward.rb
index 711f40e..75605df 100644
--- a/app/models/fluentd/setting/out_forward.rb
+++ b/app/models/fluentd/setting/out_forward.rb
@@ -14,18 +14,31 @@ class Fluentd
         validates :host, presence: true
       end
 
+      class Secondary
+        include Common
+        KEYS = [
+          :path, :type
+        ].freeze
+
+        attr_accessor(*KEYS)
+
+        hidden :type
+        validates :path, presence: true
+      end
+
       include Common
 
       KEYS = [
         :match,
         :send_timeout, :recover_wait, :heartbeat_type, :heartbeat_interval,
         :phi_threshold, :hard_timeout,
-        :server
+        :server, :secondary
       ].freeze
 
       attr_accessor(*KEYS)
       choice :heartbeat_type, %w(udp tcp)
       nested :server, Server
+      nested :secondary, Secondary
 
       validates :match, presence: true
       validate :validate_at_least_one_server
diff --git a/app/views/fluentd/settings/out_forward/_form.html.haml b/app/views/fluentd/settings/out_forward/_form.html.haml
index ce23683..abe8feb 100644
--- a/app/views/fluentd/settings/out_forward/_form.html.haml
+++ b/app/views/fluentd/settings/out_forward/_form.html.haml
@@ -3,6 +3,7 @@
 = form_for(@setting, url: finish_fluentd_setting_out_forward_path(@fluentd), html: {class: "ignore-rails-error-div"}) do |f|
   = field(f, :match)
   = field(f, :server)
+  = field(f, :secondary)
 
   .well.well-sm
     %h4{"data-toggle" => "collapse", "href" => "#advanced-setting"}
diff --git a/spec/models/fluentd/setting/common_spec.rb b/spec/models/fluentd/setting/common_spec.rb
index 0c90f9c..de3c1c4 100644
--- a/spec/models/fluentd/setting/common_spec.rb
+++ b/spec/models/fluentd/setting/common_spec.rb
@@ -32,6 +32,18 @@ describe Fluentd::Setting::Common do
       it { subject.column_type(:foo).should_not == :flag }
     end
 
+    describe "#hidden" do
+      subject do
+        Class.new do
+          include Fluentd::Setting::Common
+          attr_accessor :hide
+          hidden :hide
+        end.new
+      end
+
+      it { subject.column_type(:hide).should == :hidden }
+    end
+
     describe "#choice" do
       subject do
         Class.new do
@@ -109,10 +121,11 @@ describe Fluentd::Setting::Common do
         end
         @klass = Class.new do
           include Fluentd::Setting::Common
-          KEYS = [:key1, :key2, :flag1, :ch, :child, :string] # FIXME: display "warning: already initialized constant KEYS", but works :(
+          KEYS = [:key1, :key2, :flag1, :hide, :ch, :child, :string] # FIXME: display "warning: already initialized constant KEYS", but works :(
           attr_accessor(*KEYS)
           booleans :key1, :key2
           flags :flag1
+          hidden :hide
           choice :ch, %w(foo bar)
           nested :child, Child
         end
@@ -140,6 +153,11 @@ describe Fluentd::Setting::Common do
         end
       end
 
+      describe "hidden" do
+        let(:params) { {hide: "foo"} }
+        it { should include("hide foo\n") }
+      end
+
       describe "choice" do
         let(:params) { {ch: "foo"} }
         it { should include("ch foo\n") }