index 9e78286bb59c93ec1c5f5eece553efd31d487f1f..fd54c4425dc641ab973cb37680df836f9dd041ba 100644 (file)
@@ -885,7 +885,9 @@ SELECT plainto_tsquery('english', 'The Fat & Rats:C');
ranking for the given document vector and query, as described in
Clarke, Cormack, and Tudhope's "Relevance Ranking for One to Three
Term Queries" in the journal "Information Processing and Management",
- 1999.
+ 1999. Cover density is similar to <function>ts_rank</> ranking
+ except that the proximity of matching lexemes to each other is
+ taken into consideration.
</para>
<para>