README.md in sidekiq-throttled-0.3.2 vs README.md in sidekiq-throttled-0.4.0

@@ -10,25 +10,21 @@
 
 ## Installation
 
 Add this line to your application's Gemfile:
 
-```ruby
+``` ruby
 gem "sidekiq-throttled"
 ```
 
 And then execute:
 
-```
-$ bundle
-```
+    $ bundle
 
 Or install it yourself as:
 
-```
-$ gem install sidekiq-throttled
-```
+    $ gem install sidekiq-throttled
 
 
 ## Usage
 
 Add somewhere in your app's bootstrap (e.g. `config/initializers/sidekiq.rb` if
@@ -82,9 +78,43 @@
   def perform(user_id)
     # ...
   end
 end
 ```
+
+You can also supply dynamic values for limits and periods by supplying a proc
+for these values. The proc will be evaluated at the time the job is fetched
+and will receive the same arguments that are passed to the job.
+
+``` ruby
+class MyWorker
+  include Sidekiq::Worker
+  include Sidekiq::Throttled::Worker
+
+  sidekiq_options :queue => :my_queue
+
+  sidekiq_throttle({
+    # Allow maximum 1000 concurrent jobs of this class at a time for VIPs and 10 for all other users.
+    :concurrency => {
+      :limit      => ->(user_id) { User.vip?(user_id) ? 1_000 : 10 },
+      :key_suffix => ->(user_id) { User.vip?(user_id) ? "vip" : "std" }
+    },
+    # Allow 1000 jobs/hour to be processed for VIPs and 10/day for all others
+    :threshold   => {
+      :limit      => ->(user_id) { User.vip?(user_id) ? 1_000 : 10 },
+      :period     => ->(user_id) { User.vip?(user_id) ? 1.hour : 1.day },
+      :key_suffix => ->(user_id) { User.vip?(user_id) ? "vip" : "std" }
+  })
+
+  def perform(user_id)
+    # ...
+  end
+end
+```
+
+**NB** Don't forget to specify `:key_suffix` and make it return different values
+if you are using dynamic limit/period options. Otherwise you risk getting into
+some trouble.
 
 
 ## Supported Ruby Versions
 
 This library aims to support and is [tested against][travis] the following Ruby