diff --git a/docs/physical-network.md b/docs/physical-network.md
index 2e2427f..34424a6 100644
--- a/docs/physical-network.md
+++ b/docs/physical-network.md
@@ -8,6 +8,7 @@ graph TB
   Q(Pizero Zigbee) --> A;
   A[Laundry Switch] <-->|Outside| B[Garage Switch];
   B --> F(Microserver)
+  B --> R(HC4)
   B --> G(kubemaster)
   B --> H(agent0)
   B --> I(agent1)
@@ -30,7 +31,7 @@ The link between the laundry room and the garage runs under the decking and arou
 
 The lab and NAS is in the garage and connected to the HP switch.
 
-The lab is a [Kubernetes](kubernetes.md) cluster running on 4 Intel NUCs (1 master, 3 agents) and a NAS on the HP Microserver.
+The lab is a [Kubernetes](kubernetes.md) cluster running on 4 Intel NUCs (1 master, 3 agents) and a NAS on the HP Microserver and HC4.
 
 ## VLANs