diff --git a/README.md b/README.md
index d328d78..6e8e780 100644
--- a/README.md
+++ b/README.md
@@ -17,4 +17,8 @@ Bash script to test speed of DNS queries. It does it digging some servers.
 ## adblock_test.sh
 Command-line tool to test if a DNS server blocks ads (e.g. pihole). You can specify another DNS server (by default it reads entries from resolv.conf).
 
-```curl -s https://gitea.avc.cx/borekon/scripts/raw/branch/main/adblock_test.sh | bash```
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+```curl -s https://gitea.avc.cx/borekon/scripts/raw/branch/main/adblock_test.sh | bash```
+
+Execute with a custom DNS server:
+
+```curl -s https://gitea.avc.cx/borekon/scripts/raw/branch/main/adblock_test.sh | bash -s -- 1.1.1.1```
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