diff --git a/NOTICE b/NOTICE
index 3db1a2f3..45886df9 100644
--- a/NOTICE
+++ b/NOTICE
@@ -47,6 +47,9 @@ Changes:
 - src/,,config_mc64.s (2026-10-18): DOS_WEDGE on, TRANSCENDENTAL_FUNCTIONS off.
 - src/basic/wedge/wedge_dos.s (2026-10-18): a DOS command sent with @ prints the status the
   drive gives for it; closing every file first had reset it to OK.
+- src/kernal/iec/iec_tx_byte.s, iec_tx_command.s (2026-10-18): IRQs are disabled before CLK
+  is released to send a byte; an IRQ in between could hide the listener's EOI
+  acknowledgement and hang the transfer.
 - src/aliases/,aliases_hardware_arnitech.s, src/kernal/arnitech/arnitech_net.s (new),
   src/kernal/arnitech/ff00.arnitech_jumptable.s, CONFIG.md (2026-10-18): version 2 of the
   Arnitech jump table, with JMPs from $FF0C that reset a Network Card's CS8900A at the