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@@ -266,16 +266,15 @@ Great - now you are ready to start development.  The first thing we'll do is to
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     # File: vendor/plugins/yaffle/lib/core_ext.rb
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-    class String
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-      # returns the current string, prefixed by "squawk!"
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+    String.class_eval do
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       def to_squawk
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         "squawk! #{self}".strip
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       end
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     end
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-To test that your method does what it says it does, run the unit tests.  To make sure your code is picked up by 
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+When monkey-patching existing classes it's often better to use `class_eval` instead of opening the class directly.
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-To test this, fire up a console and start squawking:
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+To test that your method does what it says it does, run the unit tests.  To test this manually, fire up a console and start squawking:
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     script/console
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     >> "Hello World".to_squawk
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@@ -824,3 +823,40 @@ References
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 * [http://nubyonrails.com/articles/2006/05/09/the-complete-guide-to-rails-plugins-part-ii](http://nubyonrails.com/articles/2006/05/09/the-complete-guide-to-rails-plugins-part-ii)
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 * [http://github.com/technoweenie/attachment_fu/tree/master](http://github.com/technoweenie/attachment_fu/tree/master)
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 * [http://daddy.platte.name/2007/05/rails-plugins-keep-initrb-thin.html](http://daddy.platte.name/2007/05/rails-plugins-keep-initrb-thin.html)
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+
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+Appendices
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+------------------------
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+
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+The final plugin should have a directory structure that looks something like this:
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+
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+    |-- MIT-LICENSE
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+    |-- README
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+    |-- Rakefile
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+    |-- generators
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+    |   `-- yaffle
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+    |       |-- USAGE
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+    |       |-- templates
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+    |       |   `-- definition.txt
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+    |       `-- yaffle_generator.rb
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+    |-- init.rb
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+    |-- install.rb
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+    |-- lib
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+    |   |-- acts_as_yaffle.rb
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+    |   |-- commands.rb
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+    |   |-- core_ext.rb
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+    |   |-- routing.rb
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+    |   `-- view_helpers.rb
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+    |-- tasks
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+    |   `-- yaffle_tasks.rake
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+    |-- test
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+    |   |-- acts_as_yaffle_test.rb
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+    |   |-- core_ext_test.rb
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+    |   |-- database.yml
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+    |   |-- debug.log
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+    |   |-- routing_test.rb
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+    |   |-- schema.rb
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+    |   |-- test_helper.rb
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+    |   `-- view_helpers_test.rb
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+    |-- uninstall.rb
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+    `-- yaffle_plugin.sqlite3.db
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+