diff --git a/tslib/types/src/index.ts b/tslib/types/src/index.ts
index 4272a4d5..fab91d7d 100644
--- a/tslib/types/src/index.ts
+++ b/tslib/types/src/index.ts
@@ -60,6 +60,7 @@ export type Study = {
   union_user_attrs: AttributeSpec[]
   datetime_start?: Date
   trials: Trial[]
+  metric_names?: string[]
 }
 
 export type Trial = {