diff --git a/README.md b/README.md
index bcd1da3c6..2013039f5 100644
--- a/README.md
+++ b/README.md
@@ -59,23 +59,24 @@ WHERE
 ``` 
 ###   Feature2 :Include Query、Insert、Delete and Update
 ```cs 
+//query  by nav
 var list=db.Queryable<Test>()
            .Includes(x => x.Provinces,x=>x.Citys ,x=>x.Street) //multi-level
            .Includes(x => x.ClassInfo) 
            .ToList();
-
+//insert by nav
  db.InsertNav(list) //Finer operation than EFCore's SaveChange
             .Include(z1 => z1.SchoolA) 
             .ThenInclude(z1 => z1.RoomList)  
             .Include(z1 => z1.Books) 
             .ExecuteCommand(); 
-               
+//delete by nav               
  db.DeleteNav<Student>(it=>it.Id==1) 
             .Include(z1 => z1.SchoolA) 
             .ThenInclude(z1 => z1.RoomList) st
             .Include(z1 => z1.Books) 
             .ExecuteCommand();  
-     
+//update by nav     
  db.UpdateNav(list)
             .Include(z1 => z1.SchoolA) 
             .ThenInclude(z1 => z1.RoomList)