The wiki technology [4] proved to be an appropriate tool for sharing global knowledge, as it provides an easy way to contribute and consume information. The way wikis are used, e.g. consuming and contributing information, naturally matches the peer-to-peer (p2p) paradigm, which inherently follows the structure of its distributed users. Compared to client-server solutions, it has significantly lower maintenance costs, no bottleneck or single point of failure, and resources are used and offered by all users. We propose a purely p2p based wiki engine (PIKI) with the focus on concurrent editing, version control, and decentralized full-text search (in a structured overlay). Further we elaborate tracking semantic information between linked articles through different versions, where a typed link itself holds meta-data about the linked files.