--- /dev/null
+@node FreqIndex
+@section Index files for freqing
+
+In many cases you do not know exact files list on remote machine you
+want to freq from. Because files can be updated there. It is useful to
+run cron-ed job on it to create files listing you can freq and search
+for files in it:
+
+@example
+0 4 * * * cd /storage ; tmp=`mktemp` ; \
+ tree -f -h -N --du --timefmt \%Y-\%m-\%d |
+ zstdmt -19 > $tmp && chmod 644 $tmp && mv $tmp TREE.txt.zst ; \
+ tree -J -f --timefmt \%Y-\%m-\%d |
+ zstdmt -19 > $tmp && chmod 644 $tmp && mv $tmp TREE.json.zst
+@end example