ruby/ruby — pull request #450 by edward (2013-11-14 22:12:51+00:00)
Title: Fixes/clarifies Observer.rb documentation

I had trouble reading through the Observer.rb documentation before I realized that it was technically incorrect: “The observers must implement a method called +update+ to receive notifications” is simply not true; it’s whatever #add_observer sets it to, and #update is just the default.