The search engine, made available by the Formal Linguistics Department of the University of Warsaw, facilitates searching digitalized texts in the DjVu format. The engine is a modification of the Poliqarp system (developed in the Institute of Computer Science of Polish Academy of Sciences) used to support the National Corpus of Polish, so it has the same query syntax. The modification has been implemented by Jakub Wilk, who also converted most of the texts to a suitable format. The idea to use Poliqarp for DjVu texts was developed by Janusz S. Bień, and presented in a paper entitled “Facilitating access to digitalized dictionaries”. The work on the search engine is supported by the Ministry of Science and Higher Education's grant no. N N519 384036.