--- a/doc/Test-system-interface	Mon Dec 20 02:36:02 2021 +0000
+++ b/doc/Test-system-interface	Mon Dec 20 03:29:23 2021 +0000
@@ -36,12 +36,31 @@
 This command is used during Tx power level calibration procedures to tell the
 RF test system to switch to a different channel.
 
+txpwr-cal-pcl pcl
+
+This command is used during Tx power level calibration procedures to tell the
+RF test system which PCL is being tested - it allows the RF test system to
+prepare for the expected power level and select the right template for ramp
+tolerance checking.
+
 power-meas
 
 This command directs the RF test system to take a power level measurement
 (txpwr-cal-setup must have been performed previously) and report it back to the
 client in the response line.
 
+power-meas ramp
+
+This command is the same as more basic power-meas, but it tells the TSID that
+the client is interested not only in the power level measurement, but also needs
+the RF test system to evaluate the ramp put out by the DUT, according to the PCL
+template selected earlier with txpwr-cal-pcl.  The response consists of the dBm
+power measurement and a ramp status keyword, separated by white space.
+
+A given TSID implementation may ignore the ramp keyword after power-meas and
+always return both values, if the actual RF test instrument always returns both
+on the same query.
+
 signal-gen-setup band
 
 This command is sent to the TSID to prepare the RF test system for tests in