diff --git a/app/controllers/fluentd/settings/notes_controller.rb b/app/controllers/fluentd/settings/notes_controller.rb
new file mode 100644
index 0000000..e1271d9
--- /dev/null
+++ b/app/controllers/fluentd/settings/notes_controller.rb
@@ -0,0 +1,20 @@
+class Fluentd::Settings::NotesController < ApplicationController
+  before_action :login_required
+  before_action :find_fluentd
+  before_action :find_note, only: [:update]
+
+  def update
+    if @note.update(params[:note][:content])
+      flash[:success] = t('messages.note_updating_success')
+    else
+      flash[:error] = t('errors.messages.note_updating_failed')
+    end
+    redirect_to daemon_setting_path
+  end
+
+  private
+
+  def find_note
+    @note = Fluentd::SettingArchive::Note.find_by_file_id(@fluentd.agent.config_backup_dir, params[:id])
+  end
+end
diff --git a/config/locales/translation_en.yml b/config/locales/translation_en.yml
index e29beaf..66fad7e 100644
--- a/config/locales/translation_en.yml
+++ b/config/locales/translation_en.yml
@@ -12,6 +12,7 @@ en:
     fluentd_status_running: Running
     fluentd_status_stopped: Stopped
     config_successfully_copied: "Config has been copied successfully. Please restart %{brand} to use the new config"
+    note_updating_success: "Note successfully updated."
 
   terms: &terms
     name: Name
@@ -284,6 +285,7 @@ en:
       is_a_directory: is a directory. should be a file
       duplicated_conf: Configurations is duplicated
       out_forward_blank_server: server settings should be at least one
+      note_updating_failed: Updating the note is failed. See application logs.
 
   activemodel: &activemodel
     errors:
diff --git a/config/locales/translation_ja.yml b/config/locales/translation_ja.yml
index 3e3d63d..cb0d840 100644
--- a/config/locales/translation_ja.yml
+++ b/config/locales/translation_ja.yml
@@ -12,6 +12,7 @@ ja:
     fluentd_status_running: 稼働中
     fluentd_status_stopped: 停止中
     config_successfully_copied: "設定をコピーしました。反映させるには、 %{brand}を再起動してください。"
+    note_updating_success: "メモを更新しました。"
 
   terms: &terms
     name: アカウント名
@@ -289,6 +290,7 @@ ja:
       is_a_directory: はディレクトリです。ファイルを指定してください
       duplicated_conf: 同じ内容の設定がすでに存在しています
       out_forward_blank_server: serverの設定がありません。
+      note_updating_failed: メモの更新に失敗しました。ログを確認して下さい。
 
   activemodel: &activemodel
     errors:
diff --git a/config/routes.rb b/config/routes.rb
index 1f86f7a..42ea789 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -68,6 +68,8 @@ Rails.application.routes.draw do
           post "reuse", action: 'reuse', on: :member, as: 'reuse'
         end
 
+        resources :notes, only: [:update], module: :settings, controller: :notes
+
         resource :running_backup, only: [:show], module: :settings, controller: :running_backup do
           post "reuse", action: 'reuse', on: :member, as: 'reuse'
         end