diff --git a/docs/en/14-reference/03-taos-sql/21-node.md b/docs/en/14-reference/03-taos-sql/21-node.md
index 2ebccb76f7..cdc4bdd020 100644
--- a/docs/en/14-reference/03-taos-sql/21-node.md
+++ b/docs/en/14-reference/03-taos-sql/21-node.md
@@ -27,11 +27,15 @@ The preceding SQL command shows all dnodes in the cluster with the ID, endpoint,
 ## Delete a DNODE
 
 ```sql
-DROP DNODE dnode_id
+DROP DNODE dnode_id [force] [unsafe]
 ```
 
 Note that deleting a dnode does not stop its process. You must stop the process after the dnode is deleted.
 
+Only online node is allowed to be deleted. Drop is executed with force option if the offline node need to be deleted.
+
+Drop is executed with unsafe option if the node with single replica is offline, and the data on it is not able to be restored.
+
 ## Modify Dnode Configuration
 
 ```sql
diff --git a/docs/zh/14-reference/03-taos-sql/21-node.md b/docs/zh/14-reference/03-taos-sql/21-node.md
index 967cb51127..e3a672790c 100644
--- a/docs/zh/14-reference/03-taos-sql/21-node.md
+++ b/docs/zh/14-reference/03-taos-sql/21-node.md
@@ -27,11 +27,15 @@ SHOW DNODES;
 ## 删除数据节点
 
 ```sql
-DROP DNODE dnode_id
+DROP DNODE dnode_id [force] [unsafe]
 ```
 
 注意删除 dnode 不等于停止相应的进程。实际中推荐先将一个 dnode 删除之后再停止其所对应的进程。
 
+只有在线节点可以被删除。如果要强制删除离线节点，需要执行强制删除操作, 即指定force选项。
+
+当节点上存在单副本，并且节点处于离线，如果要强制删除该节点，需要执行非安全删除，即制定unsafe，并且数据不可再恢复。
+
 ## 修改数据节点配置
 
 ```sql