Abstract: A method and a system for generating a plurality of annotation vectors for a document, the plurality of annotation vectors to be used as features by a first machine-learning algorithm (MLA) for information retrieval, the method executable by a second MLA on a server, the method comprising: retrieving the document, the document having been indexed by a search engine server, retrieving a plurality of queries having been used to discover the document, retrieving a plurality of user interaction parameters for each one of the plurality of queries, generating the plurality of annotation vectors, each annotation vector being associated with a respective query of the plurality of queries, each annotation vector of the plurality of annotation vectors including an indication of: the respective query, a plurality of query features, the plurality of query features being at least indicative of linguistic features, and the plurality of user interaction parameters.