--- a/doc/Host-tools-overview	Thu Mar 24 03:40:35 2022 +0000
+++ b/doc/Host-tools-overview	Thu Mar 24 04:00:37 2022 +0000
@@ -241,6 +241,10 @@
 imei-luhn	A simple utility for computing or verifying the Luhn check
 		digit of an IMEI number.
 
+l1trace-filter	This program connects to rvinterf as a client and displays only
+		certain filtered L1 traces; it was written for the purpose of
+		isolating specific traces of interest out of the noise.
+
 make-imeisv	This utility is intended for use in shell scripts: it constructs
 		a 16-digit IMEISV from a 15-digit IMEI (which must have a valid
 		Luhn check digit) and a 2-digit SV field.