diff --git a/platforms/GoSXB/gosxb-of816.sh b/platforms/GoSXB/gosxb-of816.sh
new file mode 100644
index 0000000..06b7e38
--- /dev/null
+++ b/platforms/GoSXB/gosxb-of816.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+gosxb -load 0x200000:forth -rom-bank 0x20 -rom-file rom
diff --git a/platforms/GoSXB/romboot.s b/platforms/GoSXB/romboot.s
index 4433a5a..3fe3217 100644
--- a/platforms/GoSXB/romboot.s
+++ b/platforms/GoSXB/romboot.s
@@ -1,3 +1,9 @@
+; This is a stub ROM for the GoSXB emulator that will jump to $200000 upon
+; reset, NMI, or BRK.
+; For every other kind of interrupt, it causes GoSXB to exit.  If it happens
+; to be running on real hardware, it will hang instead of exit.
+; The purpose of this stub is to execute OF816 in ROM in bank $20.
+
 .p816
 .a16
 .i16