diff --git a/docs/home-network/services/pi-hole.md b/docs/home-network/services/pi-hole.md
index 790cf60..ce8365b 100644
--- a/docs/home-network/services/pi-hole.md
+++ b/docs/home-network/services/pi-hole.md
@@ -5,6 +5,8 @@
 Host: raspberrypi
 Port: 53
 
+Upstream DNS server: 192.168.0.1 (i.e. ISP DNS)
+
 ## Groups
 
 Default