diff --git a/PROXY_GUIDELINE.md b/PROXY_GUIDELINE.md
index a1770db..913ddda 100644
--- a/PROXY_GUIDELINE.md
+++ b/PROXY_GUIDELINE.md
@@ -164,5 +164,17 @@ vmrun -T ws snapshot /path/to/vmx/file snapshot_name
 ```
 
 ```python
-env = DesktopEnv(snapshot_name="snapshot_name")
+# Modify snapshot_name in "desktop_env/envs/desktop_env.py", line 50
+snapshot_name: str = "snapshot_name",
 ```
+
+#### 4. Modify chrome startup command
+
+By searching `"--remote-debugging-port=1337"` , you can find all the places that involve Chrome startup commands, and add parameter `--proxy-server=host_IP:port`
+```python
+# example
+# before
+"command": ["google-chrome","--remote-debugging-port=1337"]
+# after
+"command": ["google-chrome","--remote-debugging-port=1337","--proxy-server=host_IP:port"]
+```
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