diff --git a/doc/source/planning/kubernetes/network-planning-the-pxe-boot-network.rst b/doc/source/planning/kubernetes/network-planning-the-pxe-boot-network.rst
index 6133cbe1b..00817223b 100755
--- a/doc/source/planning/kubernetes/network-planning-the-pxe-boot-network.rst
+++ b/doc/source/planning/kubernetes/network-planning-the-pxe-boot-network.rst
@@ -23,3 +23,8 @@ IPv4.
 
 .. note::
     |prod| does not support IPv6 |PXE| booting.
+
+.. note::
+
+    When you use the |PXE| boot network, the |PXE| boot network and management
+    network should be isolated with |VLAN|.