diff --git a/OpenZFS-exceptions.md b/OpenZFS-exceptions.md
index f403c53..6fe7bdf 100644
--- a/OpenZFS-exceptions.md
+++ b/OpenZFS-exceptions.md
@@ -74,6 +74,7 @@ OpenZFS issue id | status/ZFS commit | comment
 4206|2820bc4|
 4188|2e7b765|
 4161|-      |The Linux user space reader/writer implementation is based on phtread primitives.
+4128|!      |The ldi_ev_register_callbacks() interface doesn't exist under Linux.  It may be possible to receive similar notifications via the scsi error handlers or possibly a different interface.
 4072|-      |None of the illumos build system is used under Linux.
 3947|7f9d994|
 3928|-      |Neither vnodes or their associated events exist under Linux.