Enum-Set.md

@@ -19,6 +19,14 @@ create_table :posts do |t|
 end
 ```
 
+If you want to add a default value that is an array containing elements, you will need to enable the [`use_extended_defaults`](https://github.com/crashtech/torque-postgresql/wiki/Configuring#use_extended_defaults) setting. This is still experimental so use with precaution.
+```ruby
+create_table :posts do |t|
+  t.string :title
+  t.permissions :creator_permissions, array: true, default: %w(read write exec)
+end
+```
+
 ### The type Class
 
 Each enum type loaded from the database will have its own class type of value for sets, created under the [`enum.namespace`](https://github.com/crashtech/torque-postgresql/wiki/Configuring#enum.namespace) namespace.