diff --git a/reference/function/aggregation.md b/reference/function/aggregation.md
index dffe5806..943aa41d 100644
--- a/reference/function/aggregation.md
+++ b/reference/function/aggregation.md
@@ -852,7 +852,7 @@ values.
 
 ### Return value
 
-Return value type is `varchar`.
+Return value type is `string`.
 
 ### Examples