diff --git a/src/vmm_mad/exec/vmm_exec_kvm.conf b/src/vmm_mad/exec/vmm_exec_kvm.conf
index 13e882b4c7..8002360a79 100644
--- a/src/vmm_mad/exec/vmm_exec_kvm.conf
+++ b/src/vmm_mad/exec/vmm_exec_kvm.conf
@@ -21,7 +21,7 @@
 #  - os [kernel,initrd,boot,root,kernel_cmd,arch]
 #  - vcpu
 #  - features [acpi, pae]
-#  - disk [driver, cache]
+#  - disk [driver, cache, io]
 #  - nic  [filter, model]
 #  - raw