diff --git a/README.md b/README.md
index 910a205..1a731f4 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,23 @@ I have tested on Windows 10 22H2 10.0.19045.2311 x64 with WSA 2210.40000.7.0.
 
 If you don't want to build WsaPatch.dll and patch icu.dll yourself,
 you can download the prebuilt binaries from the [release page](https://github.com/cinit/WSAPatch/releases).
-(They are marked as "pre-release" because I don't know if they are stable enough.)
+
+#### About winhttp.dll
+
+- WsaClient.exe does use GetProcAddress to get some functions from winhttp.dll.
+- Some functions exist in winhttp.dll of Windows 11 22H2, but not in Windows 10 22H2.
+- If you create a file `EnableDebugConsole` in WsaClient directory or set `wsapatch::kDebug` in [WsaPatch.cpp](WsaPatch.cpp) to true,
+  you will see the following message from log console.
+- If you copy a winhttp.dll from Windows 11 22H2 to WsaClient directory, WsaClient.exe will be able to find these functions.
+- WSA will still run even if you don't copy a winhttp.dll with these symbols.
+
+```text
+12-10 16:16:29.474 W WsaPatch: -GetProcAddress: hModule=C:\WINDOWS\SYSTEM32\WINHTTP.dll(00007FFC64780000), lpProcName=WinHttpRegisterProxyChangeNotification, result=NULL
+12-10 16:16:29.474 W WsaPatch: -GetProcAddress: hModule=C:\WINDOWS\SYSTEM32\WINHTTP.dll(00007FFC64780000), lpProcName=WinHttpUnregisterProxyChangeNotification, result=NULL
+12-10 16:16:29.474 W WsaPatch: -GetProcAddress: hModule=C:\WINDOWS\SYSTEM32\WINHTTP.dll(00007FFC64780000), lpProcName=WinHttpGetProxySettingsEx, result=NULL
+12-10 16:16:29.474 W WsaPatch: -GetProcAddress: hModule=C:\WINDOWS\SYSTEM32\WINHTTP.dll(00007FFC64780000), lpProcName=WinHttpGetProxySettingsResultEx, result=NULL
+12-10 16:16:29.474 W WsaPatch: -GetProcAddress: hModule=C:\WINDOWS\SYSTEM32\WINHTTP.dll(00007FFC64780000), lpProcName=WinHttpFreeProxySettingsEx, result=NULL
+```
 
 ### Problems I met
 
diff --git a/README_zhs.md b/README_zhs.md
index 362be50..ff32a81 100644
--- a/README_zhs.md
+++ b/README_zhs.md
@@ -56,6 +56,23 @@
 
 编译好的 WsaPatch.dll 和修改过的 icu.dll 可以从 [release 页面](https://github.com/cinit/WSAPatch/releases) 下载.
 
+#### 关于 winhttp.dll
+
+- WsaClient.exe 会用 GetProcAddress 从 winhttp.dll 动态获取一些符号.
+- 有些符号是只有在 Windows 11 的 winhttp.dll 里才有，Windows 10 的 winhttp.dll 缺少这些符号.
+- 如果你在 WsaClient 文件夹建一个名为 `EnableDebugConsole` 的文件(没有扩展名)或者把 [WsaPatch.cpp](WsaPatch.cpp) 里的 `wsapatch::kDebug` 改成 true,
+  你能看到 GetProcAddress 有些结果是 NULL.
+- 如果你找一个 Windows 11 22H2 的 winhttp.dll 放到 WsaClient 文件夹里(或者 WSA 安装目录)，WsaClient.exe 就能找到这些符号了.
+- 但是不管 WsaClient.exe 能否找得到这些符号，它都能用.
+
+```text
+12-10 16:16:29.474 W WsaPatch: -GetProcAddress: hModule=C:\WINDOWS\SYSTEM32\WINHTTP.dll(00007FFC64780000), lpProcName=WinHttpRegisterProxyChangeNotification, result=NULL
+12-10 16:16:29.474 W WsaPatch: -GetProcAddress: hModule=C:\WINDOWS\SYSTEM32\WINHTTP.dll(00007FFC64780000), lpProcName=WinHttpUnregisterProxyChangeNotification, result=NULL
+12-10 16:16:29.474 W WsaPatch: -GetProcAddress: hModule=C:\WINDOWS\SYSTEM32\WINHTTP.dll(00007FFC64780000), lpProcName=WinHttpGetProxySettingsEx, result=NULL
+12-10 16:16:29.474 W WsaPatch: -GetProcAddress: hModule=C:\WINDOWS\SYSTEM32\WINHTTP.dll(00007FFC64780000), lpProcName=WinHttpGetProxySettingsResultEx, result=NULL
+12-10 16:16:29.474 W WsaPatch: -GetProcAddress: hModule=C:\WINDOWS\SYSTEM32\WINHTTP.dll(00007FFC64780000), lpProcName=WinHttpFreeProxySettingsEx, result=NULL
+```
+
 ### 可能遇到的问题
 
 1. 如果老版本的 WSA 2209.40000.26.0 开了开发者模式也连不上 ADB (端口没有进程监听), 更新到 WSA 2210.40000.7.0 就可以了.