cleanup, adding missing link

Author: Rebecca Murphey

content/code-organization/concepts.md

@@ -25,10 +25,12 @@ some concepts that are common to all good code organization patterns.
 - Despite jQuery's DOM-centric nature, JavaScript applications are not all
   about the DOM. Remember that not all pieces of functionality need to — or
   should — have a DOM representation.
-- Units of functionality should be loosely coupled — a unit of functionality
-  should be able to exist on its own, and communication between units should be
-  handled via a messaging system such as custom events or pub/sub. Stay away
-  from direct communication between units of functionality whenever possible.
+- Units of functionality should be [loosely
+  coupled](http://en.wikipedia.org/wiki/Loose_coupling) -- a unit of
+  functionality should be able to exist on its own, and communication between
+  units should be handled via a messaging system such as custom events or
+  pub/sub. Stay away from direct communication between units of functionality
+  whenever possible.
 
 The concept of loose coupling can be especially troublesome to developers
 making their first foray into complex applications, so be mindful of this as
@@ -177,16 +179,13 @@ object literal would likely be overkill. Assuming it's not the extent of our
 application, though, we've gained several things:
 
 - We've broken our feature up into tiny methods. In the future, if we want to
-change how content is shown, it's clear where to change it. In the original
-code, this step is much harder to locate.
-
+  change how content is shown, it's clear where to change it. In the original
+  code, this step is much harder to locate.
 - We've eliminated the use of anonymous functions.
-
-- We've moved configuration options out of the body of the code and put them in a
-central location.
-
+- We've moved configuration options out of the body of the code and put them in
+  a central location.
 - We've eliminated the constraints of the chain, making the code easier to
-refactor, remix, and rearrange.
+  refactor, remix, and rearrange.
 
 For non-trivial features, object literals are a clear improvement over a long
 stretch of code stuffed in a $(document).ready() block, as they get us thinking