README.md in jbuilder_cache_multi-0.0.2 vs README.md in jbuilder_cache_multi-0.0.3

@@ -35,10 +35,16 @@
 	# Or with optional key
 
 	json.cache_collection! @people, expires_in: 10.minutes, key: 'v1' do |person|
 	  json.partial! 'person', :person => person
 	end
+	
+	# Or with a proc as a key 
+	
+	json.cache_collection! @people, expires_in: 10.minutes, key: proc {|person| person.last_posted_at } do |person|
+      json.partial! 'person', :person => person
+    end
   
 NOTE: If the items in your collection don't change frequently, it might be better to cache the entire collection like this:
 (in which case you don't need this gem)
 
 	json.cache! @people do
@@ -67,9 +73,14 @@
 1. Fork it ( https://github.com/joshblour/jbuilder_cache_multi/fork )
 2. Create your feature branch (`git checkout -b my-new-feature`)
 3. Commit your changes (`git commit -am 'Add some feature'`)
 4. Push to the branch (`git push origin my-new-feature`)
 5. Create a new Pull Request
+
+## Testing
+    bundle install
+    appraisal install
+    appraisal rake test
 
 ## Credit
 Inspired by https://github.com/n8/multi_fetch_fragments. Thank you!
 And of course https://github.com/rails/jbuilder