README.md in ohm-2.0.0.alpha3 vs README.md in ohm-2.0.0.alpha4

@@ -441,11 +441,10 @@
 lookups.
 
 In the `Event` example, the index on the name attribute will
 allow for searches like `Event.find(:name => "some value")`.
 
-Note that the {Ohm::Model::Validations#assert_unique assert_unique}
-validation and the methods {Ohm::Model::Set#find find} and
+Note that the methods {Ohm::Model::Set#find find} and
 {Ohm::Model::Set#except except} need a corresponding index in order to work.
 
 ### Finding records
 
 You can find a collection of records with the `find` method: