diff --git a/eloquent-mutators.md b/eloquent-mutators.md
index f0bd9c8d67..48b025d496 100644
--- a/eloquent-mutators.md
+++ b/eloquent-mutators.md
@@ -736,7 +736,7 @@ class User extends Model
 <a name="value-object-casting"></a>
 ### Value Object Casting
 
-You are not limited to casting values to primitive types. You may also cast values to objects. Defining custom casts that cast values to objects is very similar to casting to primitive types; however, the `set` method should return an array of key / value pairs that will be used to set raw, storable values on the model.
+You are not limited to casting values to primitive types. You may also cast values to objects. Defining custom casts that cast values to objects is very similar to casting to primitive types; however, if your value object encompasses more than one database column, the `set` method must return an array of key / value pairs that will be used to set raw, storable values on the model. If your value object only affects a single column, you should simply return the storable value.
 
 As an example, we will define a custom cast class that casts multiple model values into a single `Address` value object. We will assume the `Address` value has two public properties: `lineOne` and `lineTwo`: