diff --git a/README.md b/README.md
index ce4868b..f24433a 100644
--- a/README.md
+++ b/README.md
@@ -120,13 +120,29 @@ $ sudo service nginx restart
 $ # Login the new create site with rulingcom account and choose “Admin Area” to complete the registration of this new created site.
 ```
 
+## 開啟crontab的log(獨立顯示)
+###Open the file
+```sh
+vim /etc/rsyslog.d/50-default.conf
+```
+###Find the line that starts with: #cron.*
+```sh
+
+uncomment that line, save the file, and restart rsyslog:
+
+sudo service rsyslog restart
+
+You should now see a cron log file here:  /var/log/cron.log
+```
 ## 設定備份（以備份一週內容為例）
 ### 一、資料庫備份
 ```sh
+#### 安裝postfix，以避免NO MTA installed.
+sudo apt-get install -y postfix
 $ sudo crontab -e
 # 內容如下：
-# 0 3 * * * mongodump -o /home/backup/db/`date "+%Y%m%d"`_db
-# 0 4 * * * rm -fr /home/backup/db/`date --date="1 week ago" "+%Y%m%d"`_db
+# 0 3 * * * mongodump -o /home/backup/db/`date "+\%Y\%m\%d"`_db
+# 0 4 * * * rm -fr /home/backup/db/`date --date="1 week ago" "+\%Y\%m\%d"`_db
 ```
 
 ### 二、R4.5 網站目錄備份