diff --git a/postlfs/virtualization/qemu.xml b/postlfs/virtualization/qemu.xml
index b59a37a987..e69fdef5e7 100644
--- a/postlfs/virtualization/qemu.xml
+++ b/postlfs/virtualization/qemu.xml
@@ -478,9 +478,14 @@ qemu-img create -f qcow2 $VDISK_FILENAME $VDISK_SIZE</userinput></screen>
       instead of simulating a real disk hardware.  This can improve disk I/O
       performance, but it requires a Virtio driver in guest kernel.  Use
       it instead of a plain <option>-drive</option> if the guest kernel
-      supports Virtio.  Note that if the guest kernel is Linux, the virtual
-      disks using Virtio interface will be named <filename>vdx</filename>
-      in the devtmpfs, instead of <filename>sdx</filename>.
+      supports Virtio.  To build a Linux kernel with Virtio support for the
+      guest, use
+      <command>make defconfig &amp;&amp; make kvm_guest.config</command> to
+      create an initial kernel configuration with the Virtio drives enabled,
+      then make your customization.  And, if the guest kernel is Linux, the
+      virtual disks using Virtio interface will be named
+      <filename>vdx</filename> in the devtmpfs, instead of
+      <filename>sdx</filename>.
     </para>
 
     <para>