diff --git a/mm2src/mm2_p2p/src/behaviours/peer_store.rs b/mm2src/mm2_p2p/src/behaviours/peer_store.rs
index cd7b437f58..8d0bd44582 100644
--- a/mm2src/mm2_p2p/src/behaviours/peer_store.rs
+++ b/mm2src/mm2_p2p/src/behaviours/peer_store.rs
@@ -23,6 +23,9 @@ pub struct Connection {
 }
 
 /// A request/response protocol for some message codec.
+///
+/// TODO: implement a scoring algorithm of peers depending on
+/// their activities/connections.
 #[derive(Default)]
 pub struct Behaviour {
     /// The currently connected peers, their pending outbound and inbound responses and their known,