diff --git a/beacon_node/network/src/message_handler.rs b/beacon_node/network/src/message_handler.rs
index 2a3f38bc19..a7d6e3d07f 100644
--- a/beacon_node/network/src/message_handler.rs
+++ b/beacon_node/network/src/message_handler.rs
@@ -44,6 +44,8 @@ pub enum HandlerMessage {
     PeerDisconnected(PeerId),
     /// An RPC response/request has been received.
     RPC(PeerId, RPCEvent),
+    /// A block has been imported.
+    BlockImported(), //TODO: This comes from pub-sub - decide its contents
 }
 
 impl MessageHandler {