1. A computer-implemented method, comprising: identifying a candidate query from queries stored in a query log, wherein identifying the candidate query comprises: identifying a query from the queries stored in a query log; determining whether the query was submitted at least a minimum number of times during a time period; determining whether the query was submitted less than a maximum number of times during the time period; and identifying, by one or more computer processors, the query as the candidate query if the query was submitted at least the minimum number of times and less than the maximum number of times during the time period; generating relevancy scores for a plurality of web documents, each relevancy score associated with a corresponding web document and being a measure of the relevance of the candidate query to the web document; selecting a web document having an associated relevancy score that exceeds a relevancy threshold; and associating the selected web document with the candidate query.