Adding a missing solution for an additional question

Author: avivmu

learn/tasks/grid/marking.md

@@ -29,6 +29,17 @@ I have used the shorthands below, however it would be correct for the student to
  grid-row: 2 / 4;
 }
 ```
+###Additional question
+This extra question requires a little of research from the student. One way of achieving this would be to use `order` which we've encountered in the flexbox tutorial.
+```
+.item1 {
+ order: 2
+}
+
+.item2 {
+order: 1
+}
+```
 
 ## Grid Layout Three