diff --git a/Documentation/usb/ehci.txt b/Documentation/usb/ehci.txt
index 9dcafa7..160bd6c 100644
--- a/Documentation/usb/ehci.txt
+++ b/Documentation/usb/ehci.txt
@@ -210,3 +210,5 @@
 transfers are fully scheduled, so the main issue is likely to be how
 to trigger "high bandwidth" modes.
 
+TBD:  More than standard 80% periodic bandwidth allocation is possible
+through sysfs uframe_periodic_max parameter. Describe that.