I am going to submit a paper to a conference that uses [double-blind review](https://en.wikipedia.org/wiki/Peer_review#Different_styles_of_review). The paper extends my project X, which was published somewhere else last year. In order not to break the anonymity, in the paper shall I hide the fact that project X was mine? (If I don't they could simply look at the reference associated with project X to identify the authors.)