README.md in prefixed_ids-1.2.2 vs README.md in prefixed_ids-1.3.0

@@ -32,13 +32,29 @@
 end
 ```
 
 This will generate a value like `user_1234abcd`.
 
-To query using the prefixed ID, simply you can use either `find` or `find_by_prefixed_id`:
+##### Prefix ID Param
 
+To retrieve the prefix ID, simply call:
+
 ```ruby
+User.to_param
+```
+
+If `to_param` override is disabled:
+
+```ruby
+User.prefix_id
+```
+
+##### Query by Prefixed ID
+
+To query using the prefixed ID, you can use either `find` or `find_by_prefix_id`:
+
+```ruby
 User.find("user_5vJjbzXq9KrLEMm32iAnOP0xGDYk6dpe")
 User.find_by_prefix_id("user_5vJjbzXq9KrLEMm32iAnOP0xGDYk6dpe")
 ```
 
 We also override `to_param` by default so it'll be used in URLs automatically.
@@ -49,27 +65,46 @@
 class User < ApplicationRecord
   has_prefix_id :user, override_find: false, override_param: false
 end
 ```
 
-### Generic lookup
+##### Salt
 
+A salt is a secret value that makes it impossible to reverse engineer IDs. We recommend adding a salt to make your Prefix IDs unguessable.
+
+###### Global Salt
+
+```ruby
+# config/initializers/prefixed_ids.rb
+PrefixID.salt = "salt"
+```
+
+###### Per Model Salt
+
+```ruby
+class User
+  has_prefix_id :user, salt: "usersalt"
+end
+```
+
+### Generic Lookup By Prefix ID
+
 Imagine you have a prefixed ID but you don't know which model it belongs to.
 
 ```ruby
 PrefixedIds.find("user_5vJjbzXq9KrLEMm3")
 #=> #<User>
 PrefixedIds.find("acct_2iAnOP0xGDYk6dpe")
 #=> #<Account>
 ```
 
-### Customizing
+### Customizing Prefix IDs
 
 You can customize the prefix, length, and attribute name for PrefixedIds.
 
 ```ruby
 class Account < ApplicationRecord
-  has_prefix_id :acct, minimum_length: 32, override_find: false, to_param: false
+  has_prefix_id :acct, minimum_length: 32, override_find: false, to_param: false, salt: ""
 end
 ```
 
 ## Development