diff --git a/docs/DNS.md b/docs/DNS.md
index e718d42..3d9a4be 100644
--- a/docs/DNS.md
+++ b/docs/DNS.md
@@ -7,8 +7,9 @@ flowchart LR
   GandiDns[ Gandi ducamps.win]
   end
   subgraph Internal
-  pihole[pihole]--ducamps.win-->NAS
+  pihole[pihole]----ducamps.win-->NAS
   pihole--service.consul-->consul[consul cluster]
+  DHCP --dynamic update--> NAS
   NAS--service.consul-->consul
   end
   NAS --> recursor
@@ -26,4 +27,6 @@ Each DNS forward *service.consul* request to the consul cluster. On Pihole a tem
 
 On diskstation every request as forward to one consul node this point is to improve we because we have a possibility of outtage. du to synology DNSServer limitation we only put a forward on port 53 so we need on the target consul node to redirect port 53 to 8300 by iptables rules.
 
+a DHCP service is set to do dynamic update on NAS DNS on lease delivery
+
 external recursor are on cloudflare and FDN