lib/rack/lock.rb in rack-1.4.7 vs lib/rack/lock.rb in rack-1.5.0.beta.1

@@ -1,8 +1,10 @@
 require 'thread'
 require 'rack/body_proxy'
 
 module Rack
+  # Rack::Lock locks every request inside a mutex, so that every request
+  # will effectively be executed synchronously.
   class Lock
     FLAG = 'rack.multithread'.freeze
 
     def initialize(app, mutex = Mutex.new)
       @app, @mutex = app, mutex