Moar about static modules.

Modules.wiki

diff --git a/Modules.wiki b/Modules.wiki
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@@ -11,6 +11,11 @@
 
 app/soc is the root of Melange's first-party (authored by Melange developers) code. It is divided into:
   * *cache*
+  ** Melange's code that interacts with the App Engine memcache.
+  ** Primarily used for XSRF tokens and determining which projects, organizations, and tasks are randomly featured on the home page.
+  * *content*
+  ** Melange's static content (mostly images).
+
 
 =Dynamic Modules (How Melange Is Organized During Execution)=