diff --git a/block/pool.go b/block/pool.go
index 48d86c24c..9656533fb 100644
--- a/block/pool.go
+++ b/block/pool.go
@@ -181,6 +181,8 @@ func (bp *BlockPool) handleEvent(event_ interface{}) {
 	}
 }
 
+// NOTE: This function is sufficient, but we should find pending blocks
+// and sample the peers in one go rather than the current O(n^2) impl.
 func (bp *BlockPool) requestBlocksFromRandomPeers(maxPeers int) {
 	chosen := bp.pickAvailablePeers(maxPeers)
 	log.Debug("requestBlocksFromRandomPeers", "chosen", len(chosen))