+Option `--filters` turns on using filters from config. Currently there
+are two kind of filters: filters on languages and filter on flag
+`deleted`. They are defined in the config file the following way::
+
+ [filters]
+ lang = en ru
+ deleted = 0
+
+`lang` filters is a list of language codes separated by a space.
+`deleted` is a 0/1 flag; 0 hides deleted books from search.
+