diff --git a/README.md b/README.md
index 1bbbd838..f9a0fe93 100644
--- a/README.md
+++ b/README.md
@@ -8,9 +8,9 @@ CherryUSB is a tiny, beautiful and portable USB host and device stack for embedd
 
 ## Why choose
 
-- Ip-oriented programming, the same usb ip driver does not need to be written repeatedly, only the parts that are not the same need to be implemented
-- Code tree writing makes it easier for users to understand usb concept, enumeration process, class driver loading
-- Templating the Class driver makes it easier to use composite device and add custom drivers
+- Ip-oriented programming means the same usb ip's driver has no need to be written repeatedly, only the parts(such as `usb_xx_low_level_init`：including usb clock, usb gpio and usb irq configuration)that are not the same have to be implemented,
+- Tree-based coding makes it easier for users to understand usb concept, enumeration process and class driver loading process
+- Templating the class drivers makes it easier to use composite device and add custom drivers
 - Simplifying the complex transfer of usb makes it easier for users to use usb as easily as uart and dma
 - Fewer directory structures, fewer apis, fewer codesize, extreme usb bandwidth
 
@@ -53,7 +53,6 @@ CherryUSB Device Stack has the following functions：
 - Support Composite Device
 - Support Communication Device Class (CDC)
 - Support Human Interface Device (HID)
-- Support Custom human Interface Device (HID)
 - Support Mass Storage Class (MSC)
 - Support USB VIDEO CLASS (UVC1.0、UVC1.5)
 - Support USB AUDIO CLASS (UAC1.0、UAC2.0)
@@ -77,7 +76,7 @@ CherryUSB Device Stack resource usage (GCC 10.2 with -O2)：
 
 ## Host Stack Overview
 
-The CherryUSB Host Stack has a standard enumeration implementation for devices mounted on roothubs and external hubs, and a standard interface for the different Class to indicate what the Class driver needs to do after enumeration and after disconnection. A standard hcd porting interface has also been standardised for adapting different USB IPs for IP-oriented programming. Finally, the protocol stack is managed using os, and provides osal to make a adaptation to different os.
+The CherryUSB Host Stack has a standard enumeration implementation for devices mounted on roothubs and external hubs, and a standard interface for different Classes to indicate what the Class driver needs to do after enumeration and after disconnection. A standard hcd porting interface has also been standardised for adapting different USB IPs for IP-oriented programming. Finally, the host stack is managed using os, and provides osal to make a adaptation for different os.
 
 CherryUSB Host Stack has the following functions：
 
@@ -119,4 +118,8 @@ USB basic concepts and how the CherryUSB Device stack is implemented, see [Cherr
 |Nuvoton    |  Nuc442 | nuvoton |[nuc442_repo](https://github.com/sakumisu/CherryUSB/tree/master/demo/nuvoton/usb_device/nuc442)|
 |Nordicsemi |  Nrf52840 | nrf5x |[nrf5x_repo](https://github.com/CherryUSB/cherryusb_nrf5x)|
 |Geehy    |  APM32E10x APM32F0xx| fsdev |[apm32_repo](https://github.com/CherryUSB/cherryusb_apm32)|
-|Mindmotion    |  MM32L3xx | mm32 |[mm32_repo](https://github.com/CherryUSB/cherryusb_mm32)|
\ No newline at end of file
+|Mindmotion    |  MM32L3xx | mm32 |[mm32_repo](https://github.com/CherryUSB/cherryusb_mm32)|
+
+## Contact
+
+QQ group: 642693751
\ No newline at end of file
diff --git a/README_zh.md b/README_zh.md
index 6f2b8102..44bf4d9d 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -8,7 +8,7 @@ CherryUSB 是一个小而美的、可移植性高的、用于嵌入式系统(带
 
 ## 为什么选择
 
-- 面向 ip 编程，相同 usb ip 驱动无需重复编写，仅需实现不相同的部分
+- 面向 ip 编程，使得相同的 usb ip 驱动无需重复编写，仅需实现不相同的部分(例如实现 `usb_xx_low_level_init`：包含 usb 时钟、usb gpio、usb 中断)
 - 代码树状化编写，轻松理解 usb 概念、枚举过程、class 驱动加载
 - Class 驱动模板化，轻松实现复合设备和自定义添加驱动
 - 将 usb 的复杂传输简单化，使得用户能够像 uart、dma 一样轻松使用 usb
@@ -52,7 +52,6 @@ CherryUSB Device 协议栈当前实现以下功能：
 - 支持复合设备
 - 支持 Communication Device Class (CDC)
 - 支持 Human Interface Device (HID)
-- 支持 Custom human Interface Device (HID)
 - 支持 Mass Storage Class (MSC)
 - 支持 USB VIDEO CLASS (UVC1.0、UVC1.5)
 - 支持 USB AUDIO CLASS (UAC1.0、UAC2.0)
@@ -118,4 +117,8 @@ USB 基本知识点与 CherryUSB Device 协议栈是如何编写的，参考 [Ch
 |Nuvoton    |  Nuc442 | nuvoton |[nuc442_repo](https://github.com/sakumisu/CherryUSB/tree/master/demo/nuvoton/usb_device/nuc442)|
 |Nordicsemi |  Nrf52840 | nrf5x |[nrf5x_repo](https://github.com/CherryUSB/cherryusb_nrf5x)|
 |Geehy    |  APM32E10x APM32F0xx| fsdev |[apm32_repo](https://github.com/CherryUSB/cherryusb_apm32)|
-|Mindmotion    |  MM32L3xx | mm32 |[mm32_repo](https://github.com/CherryUSB/cherryusb_mm32)|
\ No newline at end of file
+|Mindmotion    |  MM32L3xx | mm32 |[mm32_repo](https://github.com/CherryUSB/cherryusb_mm32)|
+
+## Contact
+
+QQ 群:642693751
\ No newline at end of file