Added 'How it works'

README.md

@@ -145,6 +145,17 @@ class Task < ActiveRecord::Base
 end
 ```
 
+## How does it work?
+
+Catche intercepts a cached value and tags this value using the unique identifier for the given/loaded resource or collection. Once a resource expires it will expire the tagged cached values, such as the resource itself and the collection it belongs to.
+
+```ruby
+Catche::Tag::Collect.resource(@task) # { :set => ["tasks_1"], :expire => ["tasks_1"] }
+Catche::Tag::Collect.collection_tags(@task, Task) # { :set => ["projects_1_tasks"], :expire => ["tasks", "projects_1_tasks"] }
+```
+
+The tags will point to different cached values, for example pointing to a cached key or a cached filepath.
+
 ## Manually expiring a cache
 
 ```ruby

lib/catche/tag/collect.rb

@@ -6,7 +6,7 @@ class << self
 
         # Collects resource tags for a given resource
         #
-        #   Catche::Tag::Tagger.resource_tags(@task)
+        #   Catche::Tag::Collect.resource_tags(@task)
         #   => { :set => ["tasks_1"], :expire => ["tasks_1"] }
         def resource(resource)
           set_tags    = []
@@ -23,7 +23,7 @@ def resource(resource)
 
         # Collects collection tags for a given context, for example a controller
         #
-        #   Catche::Tag::Tagger.collection_tags(controller, Task)
+        #   Catche::Tag::Collect.collection_tags(controller, Task)
         #   => { :set => ["projects_1_tasks"], :expire => ["tasks", "projects_1_tasks"] }
         def collection(context, resource_class, include_base=true)
           associations      = Catche::ResourceLoader.fetch(context, *resource_class.catche_associations)