diff --git a/README.md b/README.md
index f24433a..14d3e92 100644
--- a/README.md
+++ b/README.md
@@ -121,11 +121,11 @@ $ # Login the new create site with rulingcom account and choose “Admin Area”
 ```
 
 ## 開啟crontab的log(獨立顯示)
-###Open the file
+### Open the file
 ```sh
-vim /etc/rsyslog.d/50-default.conf
+sudo vim /etc/rsyslog.d/50-default.conf
 ```
-###Find the line that starts with: #cron.*
+### Find the line that starts with: #cron.*
 ```sh
 
 uncomment that line, save the file, and restart rsyslog:
@@ -139,6 +139,7 @@ You should now see a cron log file here:  /var/log/cron.log
 ```sh
 #### 安裝postfix，以避免NO MTA installed.
 sudo apt-get install -y postfix
+sudo service postfix start
 $ sudo crontab -e
 # 內容如下：
 # 0 3 * * * mongodump -o /home/backup/db/`date "+\%Y\%m\%d"`_db