diff --git a/hunet/README.md b/hunet/README.md
index 2e3eeae..b38f8d8 100644
--- a/hunet/README.md
+++ b/hunet/README.md
@@ -1,6 +1,6 @@
 ```python
 from seleniumbase import Driver
-(driver := Driver(chromium_arg="--mute-audio")).open('snuh.hunet.co.kr')
+(driver := Driver(headless=True, chromium_arg="--mute-audio")).open('snuh.hunet.co.kr')
 driver._repr_png_ = driver.get_screenshot_as_png
 
 driver.type('#ID', '5F193')
@@ -17,7 +17,9 @@ while True:
     driver.sleep(5)
     if driver.is_alert_present():
         driver.wait_for_and_accept_alert()
+    driver.wait_for_element('frame')
     driver.switch_to_frame('frame')
+    driver.wait_for_element('video')
     driver.execute_script("""
         const video = document.querySelector('video');
         video.play();