--- a/doc/Host-tools-overview	Sat Feb 08 02:47:43 2020 +0000
+++ b/doc/Host-tools-overview	Mon Feb 10 02:56:21 2020 +0000
@@ -204,6 +204,15 @@
 		produced by TI's hex470 tool with -memwidth 16 -romwidth 16
 		options) to straight binary.
 
+pcm-sms-decode	Some TI-based vendor firmwares (not TI's original and not
+		FreeCalypso) implement SMS storage in their FFS in a file named
+		/pcm/SMS in the same format in which SMS records are stored in
+		SIM cards (EF_SMS elementary file).  Pirelli's firmware is one
+		major user of this mechanism.  This /pcm/SMS file can be read
+		out in vivo via fc-fsio or extracted in vitro via tiffs; the
+		new pcm-sms-decode utility decodes the stored SMS content from
+		this binary file similarly to sms-pdu-decode.
+
 pirexplore	This is a run-from-RAM (no flashing) program for Pirelli DP-L10
 		phones that exercises their peripheral hardware, primarily their
 		LCD.