diff --git a/README.md b/README.md
index bd7b856..abe0042 100644
--- a/README.md
+++ b/README.md
@@ -299,6 +299,7 @@ In your Server Hosting change (Reverse DNS Management>PTR Records(ip_adress to d
 
 DKIM 1024 bit uyarısı  
 sudo opendkim-testkey -d domain -s mail -vvv  
+dig -x IPV4 +short  
 1048 bit starts with MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQ...  
 2048 bit starts with MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A...