diff --git a/config/domains-blocklist-local-additions.txt b/config/domains-blocklist-local-additions.txt
index 99dd469..b6435d3 100644
--- a/config/domains-blocklist-local-additions.txt
+++ b/config/domains-blocklist-local-additions.txt
@@ -255,6 +255,7 @@
 *adsys*
 *adtiger*
 *adtiming*
+*adtool*
 *adtriba*
 *adv-*
 *adv.*