diff --git a/docs/chu3-national-matching.md b/docs/chu3-national-matching.md
index ee9602ff..4056e9f4 100644
--- a/docs/chu3-national-matching.md
+++ b/docs/chu3-national-matching.md
@@ -30,6 +30,7 @@ This is tested on Chusan 2.27.
 ### Firewall Rules
 
 Below is a simple command to add firewall rules for Chunithm.
+(Put this intk a text file and change the fule extension to .bat)
 
 ```shell
 @echo off