diff --git a/docs/en/module/lorawan.md b/docs/en/module/lorawan.md
index 2ff592ca..179fa322 100644
--- a/docs/en/module/lorawan.md
+++ b/docs/en/module/lorawan.md
@@ -47,13 +47,15 @@ By default, the UART configuration: "9600, 8, n, 1"(8 bits data, no parity, 1 st
 
 - **[LoRaWAN Info](http://wiki.ai-thinker.com/sx127x-052) (LoRaWAN)**
 
+- **[LoRaWAN User Manual](http://wiki.ai-thinker.com/_media/lora/docs/rhf76-052_ho_to_use_ai-thinker_s_lorawan_modem.pdf)**
+
 - **[AT command for LoRaWAN](http://wiki.ai-thinker.com/_media/rhf-ps01509_lorawan_class_ac_at_command_specification_-_v4.4.pdf)**
 
 ## Example
 
 ### Arduino IDE
 
-This is a exmaple for communication between two LoRaWAN modules.
+This is a exmaple for communication between two LoRaWAN modules refering to the section `3.6 Point to Point communication with LoRa` of [LoRaWAN User Manual](http://wiki.ai-thinker.com/_media/lora/docs/rhf76-052_ho_to_use_ai-thinker_s_lorawan_modem.pdf).
 
 **Function:** Press button B for setting 433MHz as LoRaWAN operating frequency, and sending "Hello World"; Press button C for setting 868MHz as LoRaWAN operating frequency, and sending "Hello World"; Press button A for clearing screen.
 
diff --git a/docs/en/module/stepmotor.md b/docs/en/module/stepmotor.md
index 3e706c8e..705ba939 100644
--- a/docs/en/module/stepmotor.md
+++ b/docs/en/module/stepmotor.md
@@ -21,8 +21,8 @@
 ## Include
 
 -  1x Step Motor Module
--  12V Power
--  1x 5V FAN Module for heat dissipation
+-  12V Power (Optional)
+-  1x 5V FAN Module for heat dissipation (Optional)
 
 ## Applications
 
diff --git a/docs/ja/module/stepmotor.md b/docs/ja/module/stepmotor.md
index dbc4859b..f33f4ada 100644
--- a/docs/ja/module/stepmotor.md
+++ b/docs/ja/module/stepmotor.md
@@ -21,8 +21,8 @@
 ## パッケージ内容
 
 - 1x STEPMOTOR モジュール
-- 1x 12V 電源
-- 1x 5V ファンモジュール
+- 1x 12V 電源 (オプション)
+- 1x 5V ファンモジュール (オプション)
 
 ## アプリケーション
 
diff --git a/docs/zh_CN/module/lorawan.md b/docs/zh_CN/module/lorawan.md
index 209d9dfc..233f0c1a 100644
--- a/docs/zh_CN/module/lorawan.md
+++ b/docs/zh_CN/module/lorawan.md
@@ -46,15 +46,17 @@ LoRaWAN**默认的串口配置：**
 
 - **[官方论坛](http://forum.m5stack.com/)**
 
-- **[LoRaWAN模组信息](http://wiki.ai-thinker.com/sx127x-052) (LoRaWAN)**
+- **[LoRaWAN 模组信息](http://wiki.ai-thinker.com/sx127x-052) (LoRaWAN)**
 
-- **[LoRaWAN的AT指令集](http://wiki.ai-thinker.com/_media/rhf-ps01509_lorawan_class_ac_at_command_specification_-_v4.4.pdf)**
+- **[LoRaWAN 使用手册](http://wiki.ai-thinker.com/_media/lora/docs/rhf76-052_ho_to_use_ai-thinker_s_lorawan_modem_-_cn.pdf)**
+
+- **[LoRaWAN 的 AT 指令集](http://wiki.ai-thinker.com/_media/rhf-ps01509_lorawan_class_ac_at_command_specification_-_v4.4.pdf)**
 
 ## 例程
 
 ### Arduino IDE
 
-这是两个 LoRaWAN 模块之间通信的例程。
+这是两个 LoRaWAN 模块之间通信的例程。例程根据 [LoRaWAN 使用手册](http://wiki.ai-thinker.com/_media/lora/docs/rhf76-052_ho_to_use_ai-thinker_s_lorawan_modem_-_cn.pdf)的章节 `3.6 LoRa 点对点通信`。
 
 **功能：** 按下按键 B，设置模块工作在 433MHz 频段，并发送字符串 “Hello World”; 按下按键 C，设置模块工作在 868MHz 频段，并发送字符串 “Hello World”; 按下按键 A，Core 清屏。
 
diff --git a/docs/zh_CN/module/stepmotor.md b/docs/zh_CN/module/stepmotor.md
index de76dab4..80421354 100644
--- a/docs/zh_CN/module/stepmotor.md
+++ b/docs/zh_CN/module/stepmotor.md
@@ -21,8 +21,8 @@
 ## 包含
 
 -  1x Step Motor模块
--  12V电源
--  1x 5V 风扇扇热模块
+-  12V电源 (选配)
+-  1x 5V 风扇扇热模块 (选配)
 
 ## 应用