--- a/doc/Rvinterf-tools	Thu Dec 29 22:21:04 2022 +0000
+++ b/doc/Rvinterf-tools	Thu Dec 29 23:59:00 2022 +0000
@@ -99,6 +99,17 @@
 	an unnamed and unbound socket pair instead of connecting to an already-
 	running rvinterf instance.
 
+-v
+
+	Verbose output mode.  By default the "main" user output from rvinterf
+	(stdout and/or log file) omits certain packet exchanges that cannot be
+	practically logged in any way other than a raw hex dump: TCH DL and UL
+	bits exchanged with FC firmware TCH tap feature, TM/ETM packet
+	exchanges and G23M protocol stack primitive exchanges are currently
+	envisioned as candidates for such elision from default log output.
+	-v option restores the original behaviour of dumping all such packets
+	in raw hex.
+
 -w number_in_seconds
 
 	Reliable UART communication with a Calypso GSM device that can