diff --git a/pkg/chain/chain_names.go b/pkg/chain/chain_names.go
index 8bb88c0..3e9ea5a 100644
--- a/pkg/chain/chain_names.go
+++ b/pkg/chain/chain_names.go
@@ -7,4 +7,7 @@ const (
 	// Ingress represents chains applied when crossing user/storage network boundary.
 	// It is not applied when talking between nodes.
 	Ingress Name = "ingress"
+
+	// S3 represents chains applied when crossing user/s3 network boundary.
+	S3 Name = "s3"
 )