--- a/doc/Loadtools-usage	Tue Mar 10 07:05:32 2020 +0000
+++ b/doc/Loadtools-usage	Tue Mar 10 07:24:47 2020 +0000
@@ -253,6 +253,17 @@
 	rate which should be set just before the loaded XRAM image is jumped
 	to; the default is 115200 baud.
 
+-t num
+
+	This option is common for all utilities in the loadtools suite; it sets
+	the timeout to be applied to the wait for the Calypso boot ROM response.
+	Normally the tools wait forever for the Calypso boot ROM to respond to
+	the interrupt-boot beacons that are being sent continuously at the
+	interval set with -i; this -t option sets a timeout in ms instead.
+	This option is intended for automated (unattended) environments where
+	it is used together with some kind of target boot control, either -P or
+	external.
+
 fc-iram & fc-xram 2nd program invokation
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