--- a/doc/Host-tools-overview	Wed Nov 22 04:49:29 2017 +0000
+++ b/doc/Host-tools-overview	Wed Nov 22 05:03:15 2017 +0000
@@ -124,6 +124,14 @@
 		predate ETM, and with Mot C1xx original firmwares.  It works
 		through rvinterf.
 
+fc-readcal	This program attempts to read a bunch of RF calibration tables
+		out of a running firmware through Test Mode commands: first
+		tms 1, then rfpw 7 for each band, then rftr and ttr commands to
+		read various tables.  The primary intended purpose is extracting
+		RF calibration or static configuration data from alien
+		firmwares.  Please beware that the tms 1 and rfpw 7 commands
+		sent by this tool are highly disruptive to normal GSM operation.
+
 fc-rgbconv	A simple aid for phone UI development that converts RGB color
 		values between human-intuitive 8:8:8 format and the 5:6:5 format
 		used by the color LCDs in the phones targeted by FreeCalypso.