diff --git a/p2p/sync.go b/p2p/sync.go
index cdc2a14f06..f4b7d21279 100644
--- a/p2p/sync.go
+++ b/p2p/sync.go
@@ -376,7 +376,8 @@ func (s *syncService) adaptAndSanityCheckBlock(ctx context.Context, header *spec
 					return
 				}
 
-				// todo comment
+				// once we verified p2p hash with received one above
+				// we need to overwrite it with old scheme hash
 				coreBlock.Hash, err = core.BlockHash(coreBlock)
 				if err != nil {
 					bodyCh <- blockBody{err: fmt.Errorf("failed to generate block hash: %w", err)}