diff --git a/sys/dev/usb/TODO b/sys/dev/usb/TODO
index 7c5458c7eb55..45d1d002890d 100644
--- a/sys/dev/usb/TODO
+++ b/sys/dev/usb/TODO
@@ -1,6 +1,8 @@
 Some things that need to be done in no particular order:
 --------------------------------------------------------
 
+Add lots of bus_dmamap_sync().
+
 Implement isochronous transfer mode.
 
 Implement audio driver.