The READ-IT UK technical team have published an ontology for describing the READ-IT crowdsourcing of reading experiences on GitHub. This new ontology is used to describe the data collected through the READ-IT postcard campaigns, the upcoming READ-IT chatbot for telegram and manuscripts and other sources collected through the contribution platform. The use of the Crowdsourcing Evidences ontology will enable the documentation of the context of the crowdsourcing campaigns, such as answers to questions, events, book fairs and in general the activities prompting the generation of the collected sources. The ontology is available under the CC0-V1 license (free to use, reuse, readapt) on the READ-IT GitHub page: https://github.com/eureadit/crowdsourcing-ontology.