diff --git a/Return-Data.md b/Return-Data.md
index 8b11b76..c565071 100644
--- a/Return-Data.md
+++ b/Return-Data.md
@@ -181,7 +181,11 @@ For example:
 
 Suppose A, B, and C all have id. When the queried Dto structure is: `Dto {id, a1, a2, b1, b2 }`, `A.id` is mapped. You can also specify the `id = C.id` mapping.
 
-> Reminder: You can directly map a navigation property in DTO
+Dto query only maps default fields (common attributes). For mapping objects, please use:
+
+> Navigation object: ToList(a => new Dto { Catalog = a.Catalog })
+
+> Multi table object: ToList((a, b) => new Dto { Catalog = b })
 
 ## API