Update 0004_ws2p_v1.md

rfc/0004_ws2p_v1.md

@@ -311,5 +311,10 @@ If all these conditions are respected, perform the following actions:
 
 ### Documents rebound policy
 
+Each time Duniter receives a new document, either via the client api or via ws2p, it performs the following checks: 
 
-_This documentation is still being drafted._
\ No newline at end of file
+1. Checking the document's newness (it is not already present in bdd)  
+2. Verification of the document's conformity (correct format and valid signatures)  
+3. Verification of compliance with all local index rules
+
+If all conditions are satisfied, then the document is saved in the local bdd of the node and is transmitted to all active ws2p connections.