storage/map-piece-completion.go | 1 +

diff --git a/storage/map-piece-completion.go b/storage/map-piece-completion.go
index 5f7f87eff31dc49d965baac40c5e022786bd58e5..afb1e97b64d6a1310f0235a5e19cb516f0fbfadd 100644
--- a/storage/map-piece-completion.go
+++ b/storage/map-piece-completion.go
@@ -7,6 +7,7 @@ 	"github.com/anacrolix/torrent/metainfo"
 )
 
 type mapPieceCompletion struct {
+	// TODO: Generics
 	m sync.Map
 }