diff --git a/internal/util/indexparamcheck/conf_adapter.go b/internal/util/indexparamcheck/conf_adapter.go
index 574e747a3a..99275957f7 100644
--- a/internal/util/indexparamcheck/conf_adapter.go
+++ b/internal/util/indexparamcheck/conf_adapter.go
@@ -351,6 +351,7 @@ func newHNSWConfAdapter() *HNSWConfAdapter {
 	return &HNSWConfAdapter{}
 }
 
+// ANNOYConfAdapter checks if an ANNOY index can be built.
 type ANNOYConfAdapter struct {
 	BaseConfAdapter
 }