Wiki systems are becoming an important part of the information system of many organisations and communities. This introduces the issue of the data availability in case of failure, heavy load or off-line access. We propose to replicate wiki pages across a P2P network of wiki engines. We address the problem of consistency of replicated wiki pages in the context of a P2P wiki system. In this paper, we present the architecture and the underlying algorithms of the wooki system. Compared to traditional wikis, Wooki is P2P wiki which scales, delivers better performances and allows off-line access.