diff --git a/docs/schemas/cputypes.rng b/docs/schemas/cputypes.rng
index f66bc62ba7..77c8fa783b 100644
--- a/docs/schemas/cputypes.rng
+++ b/docs/schemas/cputypes.rng
@@ -9,6 +9,7 @@
         <value>custom</value>
         <value>host-model</value>
         <value>host-passthrough</value>
+        <value>maximum</value>
       </choice>
     </attribute>
   </define>