diff --git a/protocol-3.md b/protocol-3.md
index 67dd65b..225d39b 100644
--- a/protocol-3.md
+++ b/protocol-3.md
@@ -29,9 +29,9 @@ It is recommended to keep the data in the cache for 30 seconds or so, then drop
 
 When sending a message, check the cache for the given destination. If there is a hardware address in the cache for the destination, send the message straight to that address. Otherwise, broadcast the message.
 
-### WIP, Optional: Broadcast address
+### Optional: Broadcast address
 
-Packets addressed to the broadcast address (currently undecided) can optionally be received by all nodes.
+Packets addressed to the broadcast address, an adress of an empty string, can optionally be received by all nodes om the same layer 2 network. While a node MAY forward a broadcast packet to other nodes, it SHOULD NOT, unless both sides of the forward are prepared to handle such a packet, to avoid it going around the entire layer 3 network.
 
 ### WIP, Optional: Network status packets