--- a/doc/User-oriented-commands	Wed Feb 17 17:39:26 2021 +0000
+++ b/doc/User-oriented-commands	Wed Feb 17 18:40:34 2021 +0000
@@ -302,17 +302,47 @@
 history lists.
 
 Because this LND store is a cyclic file, not linear fixed like phonebooks, it
-can only be dumped - it cannot be freely edited.  (The only update operation
-allowed on cyclic files is writing a new record that becomes the new #1,
-shifting all previous records down and losing the oldest one - but it is an
-operation to be performed by phones if they support this LND as envisioned by
-ancient spec writers, not something we are in the business of with fc-simtool.)
+does not allow random access writes: it allows random access reads like all
+regular record-based files, but the only write operation allowed by the SIM
+interface protocol and the SIM file system architecture is writing a new record
+that becomes the new #1, shifting all previous records down and losing the
+oldest one.  Because of this write access limitation, we do not provide the same
+set of operations on LND as for regular phonebooks - but we still provide good
+tinkering ability.  The following commands are available:
+
+lnd-dump
+
+This command dumps the content of the LND store on the terminal, in the same
+format as pb-dump for regular phonebooks.
+
+If you have had your SIM for a very long time, having used it in different
+phones with different firmwares, it may be interesting to look at the output of
+lnd-dump - you may have LND records that were generated ages ago by other
+phones if your current one does not write into SIM LND.
+
+lnd-dump outfile
 
-The command to dump the LND cyclic store is 'lnd-dump'.  If you have had your
-SIM for a very long time, having used it in different phones with different
-firmwares, it may be interesting to look at the output of lnd-dump - you may
-have LND records that were generated ages ago by other phones if your current
-one does not write into SIM LND.
+This form of the lnd-dump command produces the same dump format, but saves it
+in the named file instead of sending it to the terminal.
+
+lnd-restore filename
+
+This command reads the named phonebook data file (presumably written previously
+with lnd-dump) and writes it into EF_LND on the SIM.  This command works by
+first constructing a full binary image of the desired EF_LND content, then
+writing every record in the reverse order from the last index to the first.
+
+lnd-write phone-number [alpha-tag]
+
+This command writes a new record into the LND cyclic store just like a standard
+phone would do when making a record of a new outgoing call.  The two arguments
+(one required and one optional) are the same as for pb-update-imm.
+
+lnd-erase
+
+This command erases the EF_LND cyclic store, making it appear as if no outgoing
+calls have ever been recorded.  It works by writing a blank record (0xFF in
+every byte) N times, where N is the size of the cyclic store in records.
 
 Manipulating stored SMS
 =======================