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README.md

@@ -200,6 +200,20 @@ Creates a sortable and editable list of items, which can be any of the above sch
 - Similar in use to the main 'type' schema attribute.
 - Defaults to 'Text'
 
+**`toString`**
+
+- Optional, but recommended when using listType 'Object'
+- A function that returns a string representing how the object should be displayed in a list item.
+- When listType is 'NestedModel', the model's toString() method will be used
+
+Examples:
+
+    var schema = {
+        users: { type: 'List', listType: 'Object', toString: function(user) {
+                return user.firstName + ' ' + user.lastName;
+            }
+        }
+    };