Update README.md

JakeTheSnake3p0 · Jan 7, 2015 · 0451f8e · 0451f8e
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@@ -113,6 +113,13 @@ Product.first.specific
   # => #<Pen ...>
 ```
 
+If you have to come back to the parent object from the specific, the `acting_as` returns the parent element:
+
+```Ruby
+Pen.first.acting_as
+  # => #<Product ...>
+```
+
 In `has_many` case you can use subclasses:
 
 ```Ruby