diff --git a/cmd/oras/internal/display/status/progress/messenger.go b/cmd/oras/internal/display/status/progress/messenger.go
index 150b120c0..e0039c488 100644
--- a/cmd/oras/internal/display/status/progress/messenger.go
+++ b/cmd/oras/internal/display/status/progress/messenger.go
@@ -19,7 +19,7 @@ import (
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 )
 
-// Messenger is progress message channel
+// Messenger is progress message channel.
 type Messenger struct {
 	ch chan *status
 }