diff --git a/internal/rbd/types/group.go b/internal/rbd/types/group.go
index dbf22c746..a85b5e15b 100644
--- a/internal/rbd/types/group.go
+++ b/internal/rbd/types/group.go
@@ -26,10 +26,15 @@ import (
 )
 
 type journalledObject interface {
-	// GetID returns the ID in the backend storage for the object.
+	// GetID returns the CSI-handle formatted ID of the object. The handle
+	// can be parsed to locate an entry in the journal, which points to the
+	// object in the backend storage (see `GetClusterID`, `GetPool`, and
+	// `GetName`).
 	GetID(ctx context.Context) (string, error)
 
-	// GetName returns the name of the object in the backend storage.
+	// GetName returns the name in the backend storage for the object. The
+	// name is used for accessing the object though the Ceph APIs.
+	// RBD-images and RBD-groups exist in the backend with the given name.
 	GetName(ctx context.Context) (string, error)
 
 	// GetPool returns the name of the pool that holds the object.