README.md in polaroid-0.0.4 vs README.md in polaroid-0.0.5

@@ -89,10 +89,10 @@
 
 Of course you do. So the `take_snapshot` and `build_from_snapshot` methods also take a trailing `format` parameter:
 
 ```ruby
 pat = Person.new('Patrick', 25, ['beer', 'coffee', 'ramen', 'pie'])
-json_snapshot = snapshot.take_snapshot(pat, :json)
+json_snapshot = pat.take_snapshot(:json)
 # => "{\"name\":\"Patrick\",\"age\":25,\"favorite_drinks\":[\"beer\",\"coffee\"]}"
 Person.build_from_snapshot(json_snapshot, :json)
 # => #<struct Person::Snapshot name="Patrick", age=25, favorite_drinks=["beer", "coffee"]>
 ```