--- a/doc/Host-tools-overview	Thu Dec 29 21:15:36 2022 +0000
+++ b/doc/Host-tools-overview	Thu Dec 29 21:24:53 2022 +0000
@@ -249,9 +249,13 @@
 		inside Calypso devices.
 
 fc-tch2fr	This hack-utility takes a TCH downlink recording produced with
-		the tch record command in fc-shell and converts it to a playable
-		libgsm file which will most likely contain some garbage by
-		disregarding the non-understood DSP status words; see the
+		the tch record command in fc-shell (specifically, the old format
+		that will only be produced if the source of TCH DL bits is a
+		very old FC firmware version) and tries to convert it to a
+		playable libgsm file (containing garbage frames in reality,
+		resulting in very unpleasant noises on subsequent decoding) by
+		completely disregarding the DSP status words which were not
+		understood back when this hack was written in 2016.  See our
 		TCH-bit-access article for more information.
 
 fc-tmsh		TI-based GSM firmwares provide a rich set of Test Mode commands