Wiki systems have evolved in two different ways : semantic wikis and peer to peer wikis. Semantic wikis integrate the semantic web technologies in order to improve their structure, the search and the navigation between pages. Peer-to-peer wikis offer a support for massive collaboration, off-line editing mode and an ad-hoc collaboration. The main challenge in designing a peer-to-peer semantic wiki combining both approaches is the merge of wiki pages embedding semantic annotations. Merging algorithms used in peer-to-peer wiki systems have been designed for linear text. They do not handle semantic data. In this paper, we present SWooki the first peer-to-peer semantic wiki. SWooki combines the advantages of both semantic wikis and peer-to-peer wikis. We detail SWooki approach and its merging algorithm, we insist on its characteristics and its functionalities. We conclude by presenting its architecture and its implementation.