diff --git a/Modules.wiki b/Modules.wiki
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 #summary Melange Modules
 #labels 2013DeveloperDoc
 
-=Static Modules=
-==How Melange Is Organized In Source Control Directories==
+=Static Modules (How Melange Is Organized In Source Control Directories)=
 
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+==The "app" Top-Level Directory==
 
+The "app" top-level directory contains all source control-based resources that will go into the code package that will be uploaded to App Engine as part of Melange's release. It contains several third-party code directories as well as the "soc" directory that contains Melange's first-party production code.
 
-=Dynamic Modules=
-==How Melange Is Organized In Execution==
+=Dynamic Modules (How Melange Is Organized During Execution)=
 
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