diff --git a/internal/util/indexparamcheck/conf_adapter.go b/internal/util/indexparamcheck/conf_adapter.go
index 1a04ee4ccb..f24ee1704a 100644
--- a/internal/util/indexparamcheck/conf_adapter.go
+++ b/internal/util/indexparamcheck/conf_adapter.go
@@ -450,6 +450,7 @@ func newRHNSWSQConfAdapter() *RHNSWSQConfAdapter {
 	return &RHNSWSQConfAdapter{}
 }
 
+// NGTPANNGConfAdapter checks if a NGT_PANNG index can be built.
 type NGTPANNGConfAdapter struct {
 	BaseConfAdapter
 }