diff --git a/docs/schemas/networkport.rng b/docs/schemas/networkport.rng
index 8cfc043a4078383a5b858a530a89f9d84dbb82e6..ea43c03d4111a31e3bb3e440a1bf33346369095d 100644
--- a/docs/schemas/networkport.rng
+++ b/docs/schemas/networkport.rng
@@ -29,6 +29,9 @@
         <optional>
           <ref name="bandwidth"/>
         </optional>
+        <optional>
+          <ref name="vlan"/>
+        </optional>
         <optional>
           <ref name="plug"/>
         </optional>