diff --git a/internal/util/indexparamcheck/conf_adapter.go b/internal/util/indexparamcheck/conf_adapter.go
index a914b4ded3..1ee19151d4 100644
--- a/internal/util/indexparamcheck/conf_adapter.go
+++ b/internal/util/indexparamcheck/conf_adapter.go
@@ -329,6 +329,7 @@ func newNSGConfAdapter() *NSGConfAdapter {
 	return &NSGConfAdapter{}
 }
 
+// HNSWConfAdapter checks if a hnsw index can be built.
 type HNSWConfAdapter struct {
 	BaseConfAdapter
 }