diff --git a/udev/devfs_to_udev_README b/udev/devfs_to_udev_README
index b20485d1a..7c8ae77ce 100644
--- a/udev/devfs_to_udev_README
+++ b/udev/devfs_to_udev_README
@@ -16,6 +16,7 @@ README for udev
      * Kernel config:
           * disable devfs support
           * enable hotplug support
+          * enable tmpfs support
 
      * (optional) add coldplug to the SERVICES array in /etc/rc.conf