Update directory-structure.rst

source/developers/directory-structure.rst

@@ -12,6 +12,7 @@ Hierarchical model–view–controller
 The concept of the directory and file structure is to create plug-able self contained applications. It is also designed as a move to refactor the project to use the HMVC design pattern. See the following links for additional information.
 
 http://techportal.inviqa.com/2010/02/22/scaling-web-applications-with-hmvc
+
 http://net.tutsplus.com/tutorials/php/hvmc-an-introduction-and-application
 
 App Structure