diff --git a/get_runmode.js b/get_runmode.js
index fd2599a..ab091bd 100644
--- a/get_runmode.js
+++ b/get_runmode.js
@@ -1,7 +1,10 @@
 // 使用Node.js实现Shell脚本逻辑：获取公网IP并检查是否以.172结尾
-const https = require('https')
 const { execFileSync } = require('child_process')
 
+//https.get('https://api.ipify.org', (res) => {
+// `curl -s https://ifconfig.me` returns the IP address only, but open the url in browser or https.get() returns the HTML content
+// `https://api.ipify.org` returns the IP address only with curl, browser or nodejs. But it seems it doesn't work in China.
+
 // https.get 没有同步版本，使用 child_process.execFileSync 同步获取公网 IP
 let ip
 try {