diff --git a/internal/util/indexparamcheck/index_type.go b/internal/util/indexparamcheck/index_type.go
index 144030b341..17b7d37303 100644
--- a/internal/util/indexparamcheck/index_type.go
+++ b/internal/util/indexparamcheck/index_type.go
@@ -11,6 +11,7 @@
 
 package indexparamcheck
 
+// IndexType string.
 type IndexType = string
 
 const (