P2P communication paradigm is a successful solution to the problem of resources sharing as shown by the numerous real overlay networks present on Internet. One of the issue of P2P networks is how a resource shared by a peer can be made known to the other peers or, in other words, how to advertise a resource on the network. In this paper we propose an advertising method for PROSA, a P2P architecture inspired by social relationships. In the paper we show that the introduction of our resources advertising method improves PROSA performance with a low overhead.