diff --git a/docs/API_reference/en/networklib/ftp.md b/docs/API_reference/en/networklib/ftp.md
index 07f2e3f62630bb9990e8b776d0f2ab0158d7a849..a5d240fead08bf41aa6703a067517dbdd81010ca 100644
--- a/docs/API_reference/en/networklib/ftp.md
+++ b/docs/API_reference/en/networklib/ftp.md
@@ -2,6 +2,8 @@
 
 FTP (File Transfer Protocol) is a standard protocol for transferring files over a computer network. It is based on a client-server model and uses control and data connections to enable file upload, download, and management operations.  
 
+> ftplib is implemented in Python source code. If the corresponding firmware version does not support it by default, users can use the source code [ftplib.py](https://github.com/QuecPython/ftplib) and put it in the default directory /usr. When using it, change from ftplib import FTP to from usr.ftplib import FTP.
+
 ## Constructor
 
 ### `ftplib.FTP`
diff --git a/docs/API_reference/en/networklib/umqtt.md b/docs/API_reference/en/networklib/umqtt.md
index 9439f30185aafffeeefa2eb29d7d5861debcb379..5fd82eb7d7d1fc2d510aaa6ac8065de54660d81f 100644
--- a/docs/API_reference/en/networklib/umqtt.md
+++ b/docs/API_reference/en/networklib/umqtt.md
@@ -2,6 +2,8 @@
 
 This feature is used to create MQTT clients to publish and subscribe to topics.
 
+> umqtt is implemented in Python source code. If the corresponding firmware version does not support it by default, users can use the source code [umqtt.py](https://github.com/QuecPython/umqtt) and put it in the default directory /usr. When using it, change from umqtt import MQTTClient to from usr.umqtt import MQTTClient.
+
 ```
 QoS Level Description
 In MQTT protocol, three levels of QoS are defined.
@@ -15,7 +17,7 @@ QoS2 – Only once. Highest level. The message is guaranteed to be received by t
 ### `MQTTClient`
 
 ```python
-MQTTClient(client_id, server, port=0, user=None, password=None, keepalive=0, ssl=False, ssl_params={},reconn=True,version=4)
+MQTTClient(client_id, server, port=0, user=None, password=None, keepalive=60, ssl=False, ssl_params={},reconn=True,version=4)
 ```
 
 Creates MQTT clients.
@@ -29,7 +31,7 @@ Creates MQTT clients.
 | port       | Integer | Server port (optional). Default value: 1883. The default port of MQTT over SSL/TLS is 8883. |
 | user       | String  | Username registered on the server (optional).                |
 | password   | String  | Password registered on the server (optional).                |
-| keepalive  | Integer | Timeout of keep-alive (optional). Default value: 0. Unit: s. |
+| keepalive  | Integer | Timeout of keep-alive (optional). Default value: 60. Unit: s. |
 | ssl        | bool    | Enable or disable SSL/TSL encryption.                        |
 | ssl_params | String  | SSL/TLS parameter (optional).                                |
 | reconn     | bool    | Enable or disable the internal reconnection mechanism (optional). Default value: True (enable). |
diff --git a/docs/API_reference/zh/networklib/ftp.md b/docs/API_reference/zh/networklib/ftp.md
index c70f725df33be7da1830257b09f921a444bdca1a..37e957103b2969887cb7f76475d0c68806a131d7 100644
--- a/docs/API_reference/zh/networklib/ftp.md
+++ b/docs/API_reference/zh/networklib/ftp.md
@@ -2,6 +2,8 @@
 
 FTP（File Transfer Protocol）是一种用于在计算机网络中传输文件的标准协议，它基于客户端-服务器模型，通过控制连接和数据连接实现文件的上传、下载和管理操作。
 
+> ftplib是python源码实现，如对应固件版本未默认支持。用户可使用源码[ftplib.py](https://github.com/QuecPython/ftplib)，放默认目录/usr下，使用时，将from ftplib import FTP 改为from usr.ftplib import FTP.
+
 ## 构造函数
 
 ### `ftplib.FTP`
diff --git a/docs/API_reference/zh/networklib/umqtt.md b/docs/API_reference/zh/networklib/umqtt.md
index 00a6b029470667edcbf8fb99078a175ec92517d2..673a90742dfaa6bf5f6cc233996ff9f4e9b30250 100644
--- a/docs/API_reference/zh/networklib/umqtt.md
+++ b/docs/API_reference/zh/networklib/umqtt.md
@@ -2,6 +2,8 @@
 
 模块功能:提供创建MQTT客户端发布订阅功能。
 
+> umqtt 是python源码实现，如对应固件版本未默认支持。用户可使用源码 [umqtt.py](https://github.com/QuecPython/umqtt)，放默认目录/usr下，使用时，将from umqtt import MQTTClient 改为from usr.umqtt import MQTTClient.
+
 ```
 QoS级别说明
 在MQTT协议中，定义了三个级别的QoS，分别是：
@@ -15,7 +17,7 @@ QoS2 – 有且仅有一次，是最高级别；保证消息送达且仅送达
 ### `umqtt.MQTTClient`
 
 ```python
-class umqtt.MQTTClient(client_id, server, port=0, user=None, password=None, keepalive=0, ssl=False, ssl_params={},reconn=True,version=4)
+class umqtt.MQTTClient(client_id, server, port=0, user=None, password=None, keepalive=60, ssl=False, ssl_params={},reconn=True,version=4)
 ```
 
 构建mqtt连接对象。
@@ -32,7 +34,7 @@ class umqtt.MQTTClient(client_id, server, port=0, user=None, password=None, keep
 
 * `password` - （可选) 在服务器上注册的密码，字符串类型。
 
-* `keepalive` - （可选）客户端的keepalive超时值，整数类型，默认为0。
+* `keepalive` - （可选）客户端的keepalive超时值，整数类型，默认为60。
 
 * `ssl` - （可选）是否使能 SSL/TLS 支持，布尔值类型。