diff --git a/README-zh.md b/README-zh.md
index 14ea8be..f5c5ae0 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -192,7 +192,7 @@ sudo sh vpn.sh
 
 ## 重要提示
 
-*其他语言版本: [English](README.md#important-notes), [简体中文](README-zh.md#重要提示)。*
+*其他语言版本: [English](README.md#important-notes), [简体中文](README-zh.md#重要提示)。如果你有意见或建议，请[发送反馈](https://bit.ly/vpn-feedback)。*
 
 **Windows 用户** 对于 IPsec/L2TP 模式，在首次连接之前需要 [修改注册表](docs/clients-zh.md#windows-错误-809)，以解决 VPN 服务器或客户端与 NAT（比如家用路由器）的兼容问题。
 
diff --git a/README.md b/README.md
index 49d7429..39ee6e0 100644
--- a/README.md
+++ b/README.md
@@ -192,7 +192,7 @@ Enjoy your very own VPN! :sparkles::tada::rocket::sparkles:
 
 ## Important notes
 
-*Read this in other languages: [English](README.md#important-notes), [简体中文](README-zh.md#重要提示).*
+*Read this in other languages: [English](README.md#important-notes), [简体中文](README-zh.md#重要提示). Have a comment or suggestion? [Send feedback](https://bit.ly/vpn-feedback).*
 
 **Windows users**: For IPsec/L2TP mode, a [one-time registry change](docs/clients.md#windows-error-809) is required if the VPN server or client is behind NAT (e.g. home router).
 
diff --git a/docs/clients-zh.md b/docs/clients-zh.md
index bd67241..f585296 100644
--- a/docs/clients-zh.md
+++ b/docs/clients-zh.md
@@ -1,6 +1,6 @@
 # 配置 IPsec/L2TP VPN 客户端
 
-*其他语言版本: [English](clients.md), [简体中文](clients-zh.md)。*
+*其他语言版本: [English](clients.md), [简体中文](clients-zh.md)。如果你有意见或建议，请[发送反馈](https://bit.ly/vpn-feedback)。*
 
 **注：** 你也可以使用 [IKEv2](ikev2-howto-zh.md)（推荐）或者 [IPsec/XAuth](clients-xauth-zh.md) 模式连接。
 
@@ -237,7 +237,7 @@ Fedora 28（和更新版本）和 CentOS 8/7 用户可以使用 [IPsec/XAuth](cl
 
 ## 故障排除
 
-*其他语言版本: [English](clients.md#troubleshooting), [简体中文](clients-zh.md#故障排除)。*
+*其他语言版本: [English](clients.md#troubleshooting), [简体中文](clients-zh.md#故障排除)。如果你有意见或建议，请[发送反馈](https://bit.ly/vpn-feedback)。*
 
 **另见：** [检查日志及 VPN 状态](#检查日志及-vpn-状态)，[IKEv2 故障排除](ikev2-howto-zh.md#故障排除) 和 [高级用法](advanced-usage-zh.md)。
 
diff --git a/docs/clients.md b/docs/clients.md
index 806f5bf..a871c09 100644
--- a/docs/clients.md
+++ b/docs/clients.md
@@ -1,6 +1,6 @@
 # Configure IPsec/L2TP VPN Clients
 
-*Read this in other languages: [English](clients.md), [简体中文](clients-zh.md).*
+*Read this in other languages: [English](clients.md), [简体中文](clients-zh.md). Have a comment or suggestion? [Send feedback](https://bit.ly/vpn-feedback).*
 
 **Note:** You may also connect using [IKEv2](ikev2-howto.md) (recommended) or [IPsec/XAuth](clients-xauth.md) mode.
 
@@ -236,7 +236,7 @@ First check [here](https://github.com/nm-l2tp/NetworkManager-l2tp/wiki/Prebuilt-
 
 ## Troubleshooting
 
-*Read this in other languages: [English](clients.md#troubleshooting), [简体中文](clients-zh.md#故障排除).*
+*Read this in other languages: [English](clients.md#troubleshooting), [简体中文](clients-zh.md#故障排除). Have a comment or suggestion? [Send feedback](https://bit.ly/vpn-feedback).*
 
 **See also:** [Check logs and VPN status](#check-logs-and-vpn-status), [IKEv2 troubleshooting](ikev2-howto.md#troubleshooting) and [Advanced usage](advanced-usage.md).
 
diff --git a/docs/ikev2-howto-zh.md b/docs/ikev2-howto-zh.md
index 423adce..124474a 100644
--- a/docs/ikev2-howto-zh.md
+++ b/docs/ikev2-howto-zh.md
@@ -120,7 +120,7 @@ To customize IKEv2 or client options, run this script without arguments.
 
 ## 配置 IKEv2 VPN 客户端
 
-*其他语言版本: [English](ikev2-howto.md#configure-ikev2-vpn-clients), [简体中文](ikev2-howto-zh.md#配置-ikev2-vpn-客户端)。*
+*其他语言版本: [English](ikev2-howto.md#configure-ikev2-vpn-clients), [简体中文](ikev2-howto-zh.md#配置-ikev2-vpn-客户端)。如果你有意见或建议，请[发送反馈](https://bit.ly/vpn-feedback)。*
 
 **注：** 如果要添加或者导出 IKEv2 客户端，运行 `sudo ikev2.sh`。使用 `-h` 显示使用信息。客户端配置文件可以在导入后安全删除。
 
@@ -685,7 +685,7 @@ sudo ikev2.sh --revokeclient [client name]
 
 ## 故障排除
 
-*其他语言版本: [English](ikev2-howto.md#troubleshooting), [简体中文](ikev2-howto-zh.md#故障排除)。*
+*其他语言版本: [English](ikev2-howto.md#troubleshooting), [简体中文](ikev2-howto-zh.md#故障排除)。如果你有意见或建议，请[发送反馈](https://bit.ly/vpn-feedback)。*
 
 **另见：** [检查日志及 VPN 状态](clients-zh.md#检查日志及-vpn-状态)，[IKEv1 故障排除](clients-zh.md#故障排除) 和 [高级用法](advanced-usage-zh.md)。
 
diff --git a/docs/ikev2-howto.md b/docs/ikev2-howto.md
index 6bd1120..bd156e6 100644
--- a/docs/ikev2-howto.md
+++ b/docs/ikev2-howto.md
@@ -120,7 +120,7 @@ To customize IKEv2 or client options, run this script without arguments.
 
 ## Configure IKEv2 VPN clients
 
-*Read this in other languages: [English](ikev2-howto.md#configure-ikev2-vpn-clients), [简体中文](ikev2-howto-zh.md#配置-ikev2-vpn-客户端).*
+*Read this in other languages: [English](ikev2-howto.md#configure-ikev2-vpn-clients), [简体中文](ikev2-howto-zh.md#配置-ikev2-vpn-客户端). Have a comment or suggestion? [Send feedback](https://bit.ly/vpn-feedback).*
 
 **Note:** To add or export IKEv2 clients, run `sudo ikev2.sh`. Use `-h` to show usage. Client config files can be safely deleted after import.
 
@@ -687,7 +687,7 @@ Alternatively, you may manually revoke a client certificate. This can be done us
 
 ## Troubleshooting
 
-*Read this in other languages: [English](ikev2-howto.md#troubleshooting), [简体中文](ikev2-howto-zh.md#故障排除).*
+*Read this in other languages: [English](ikev2-howto.md#troubleshooting), [简体中文](ikev2-howto-zh.md#故障排除). Have a comment or suggestion? [Send feedback](https://bit.ly/vpn-feedback).*
 
 **See also:** [Check logs and VPN status](clients.md#check-logs-and-vpn-status), [IKEv1 troubleshooting](clients.md#troubleshooting) and [Advanced usage](advanced-usage.md).