README.md in prefixed_ids-1.5.1 vs README.md in prefixed_ids-1.6.0

@@ -34,21 +34,23 @@
 end
 ```
 
 This will generate a value like `user_1234abcd`.
 
+Note: You should add `has_prefix_id` before associations because it overrides `has_many` to add prefix ID lookups.
+
 ##### Prefix ID Param
 
 To retrieve the prefix ID, simply call:
 
 ```ruby
-User.to_param
[e-mail]_param
 ```
 
 If `to_param` override is disabled:
 
 ```ruby
-User.prefix_id
[e-mail]_id
 ```
 
 ##### Query by Prefixed ID
 
 To query using the prefixed ID, you can use either `find`, `find_by_prefix_id`, or `find_by_prefix_id!`: