diff --git a/content/post/pg_auto_failover_in_ubuntu_1804_psql_11.md b/content/post/pg_auto_failover_in_ubuntu_1804_psql_11.md
index 521fad3c..87b2e661 100644
--- a/content/post/pg_auto_failover_in_ubuntu_1804_psql_11.md
+++ b/content/post/pg_auto_failover_in_ubuntu_1804_psql_11.md
@@ -985,4 +985,23 @@ sudo vim /etc/logrotate.d/pgautofailover
 }    
 
 ```
+UPDATE
+
+當node 消失，需要手動在monitor上執行以下指令來移除node ，才能夠再次加入新的node
+
+```
+2019-09-24 01:11:09 [administrator@monitor ~]$ sudo runuser -l postgres -c "psql postgres://autoctl_node@monitor:5432/pg_auto_failover"
+psql (11.5 (Ubuntu 11.5-1.pgdg18.04+1))
+Type "help" for help.
+
+pg_auto_failover=> select pgautofailover.remove_node('pg-third')        
+pg_auto_failover-> ;
+ remove_node 
+-------------
+ t
+(1 row)
+
+pg_auto_failover=> 
+```
+
 
diff --git a/public/post/pg_auto_failover_in_ubuntu_1804_psql_11/index.html b/public/post/pg_auto_failover_in_ubuntu_1804_psql_11/index.html
index 623dedec..72996a04 100644
--- a/public/post/pg_auto_failover_in_ubuntu_1804_psql_11/index.html
+++ b/public/post/pg_auto_failover_in_ubuntu_1804_psql_11/index.html
@@ -1090,6 +1090,24 @@ pgautofailover                   RUNNING   pid 2232, uptime 0:00:04
 }    
 
 </code></pre>
+
+<p>UPDATE</p>
+
+<p>當node 消失，需要手動在monitor上執行以下指令來移除node ，才能夠再次加入新的node</p>
+
+<pre><code>2019-09-24 01:11:09 [administrator@monitor ~]$ sudo runuser -l postgres -c &quot;psql postgres://autoctl_node@monitor:5432/pg_auto_failover&quot;
+psql (11.5 (Ubuntu 11.5-1.pgdg18.04+1))
+Type &quot;help&quot; for help.
+
+pg_auto_failover=&gt; select pgautofailover.remove_node('pg-third')        
+pg_auto_failover-&gt; ;
+ remove_node 
+-------------
+ t
+(1 row)
+
+pg_auto_failover=&gt; 
+</code></pre>
     
 </div>