diff --git a/internal/util/indexparamcheck/conf_adapter.go b/internal/util/indexparamcheck/conf_adapter.go
index 68e7d9b31e..657e07776e 100644
--- a/internal/util/indexparamcheck/conf_adapter.go
+++ b/internal/util/indexparamcheck/conf_adapter.go
@@ -97,6 +97,7 @@ type ConfAdapter interface {
 	CheckTrain(map[string]string) bool
 }
 
+// BaseConfAdapter checks if a `FLAT` index can be built.
 type BaseConfAdapter struct {
 }