diff --git a/ip-renew/README.md b/ip-renew/README.md
index 20dd67f..ad07fc5 100644
--- a/ip-renew/README.md
+++ b/ip-renew/README.md
@@ -20,10 +20,14 @@
 
     
     # 원하는 MAC 주소로 변경
-    Set-NetAdapter -Name "이더넷" -MacAddress "00-11-22-33-44-55"
+    Set-NetAdapter -Name "이더넷" -MacAddress "00-11-22-33-44-55" -Confirm:$false
 
 
     # 랜덤 MAC 주소 생성 및 설정
     $randomMac = (0..5 | ForEach-Object { "{0:X2}" -f (Get-Random -Minimum 0 -Maximum 255) }) -join '-'
-    Set-NetAdapter -Name "이더넷" -MacAddress $randomMac
+    Set-NetAdapter -Name "이더넷" -MacAddress $randomMac -Confirm:$false
+
+    
+    # factor default 주소로 복원
+    Set-NetAdapter -Name "이더넷" -MacAddress "" -Confirm:$false
     ```
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