diff --git a/floodsub.go b/floodsub.go
index c252148..b21caad 100644
--- a/floodsub.go
+++ b/floodsub.go
@@ -346,6 +346,7 @@ func (p *PubSub) publishMessage(from peer.ID, msg *pb.Message) error {
 		select {
 		case mch <- out:
 		default:
+			log.Infof("dropping message to peer %s: queue full", pid)
 			// Drop it. The peer is too slow.
 		}
 	}