anchor.diff:  
   ## <a id='app-system-env'></a>Application-Specific System Variables ##
   
  -The subsections that follow describe the environment variables that Cloud 
  +The subsections that follow describe the environment variables that Cloud
   Foundry makes available to your application container.
  -Some of these variables are the same across instances of a single application, 
  +Some of these variables are the same across instances of a single application,
   and some vary from instance to instance.
   
  -You can access environment variables programmatically, including variables 
  +You can access environment variables programmatically, including variables
   defined by the buildpack.
  -For more inforation, refer to the buildpack documentation for 
  -[Java](../../buildpacks/java/java-tips.html#env-var), 
  -[Node.js](../../buildpacks/node/node-tips.html#env-var), and 
  +For more inforation, refer to the buildpack documentation for
  +[Java](../../buildpacks/java/java-tips.html#env-var),
  +[Node.js](../../buildpacks/node/node-tips.html#env-var), and
   [Ruby](../../buildpacks/ruby/ruby-tips.html#env-var).
   
   ### <a id='CF-INSTANCE-ADDR'></a>CF\_INSTANCE\_ADDR ###
  -The [CF\_INSTANCE\_IP](#CF-INSTANCE-IP) and 
  -[CF\_INSTANCE\_PORT](#CF-INSTANCE-PORT) of the app instance in the format 
  +The [CF\_INSTANCE\_IP](#CF-INSTANCE-IP) and
  +[CF\_INSTANCE\_PORT](#CF-INSTANCE-PORT) of the app instance in the format
   `IP:PORT`.
   
   `CF_INSTANCE_ADDR=1.2.3.4:5678`
  
positive.code: 
  ### <a id='CF-INSTANCE-PORT'></a>CF\_INSTANCE\_PORT ###
  
  The external (host-side) port corresponding to the internal (container-side) 
  port with value [PORT](#PORT). 
  For instances on Diego, this value is generally different from the 
  [PORT](#PORT) of the app instance.
  
  `CF_INSTANCE_PORT=61045`
  
  ### <a id='CF-INSTANCE-PORTS'></a>CF\_INSTANCE\_PORTS ###
  
  The list of mappings between internal (container-side) and external (host-side) 
  ports allocated to the instance's container.
  Not all of the internal ports are necessarily available for the application to 
  bind to, as some of them may be used by system-provided services that also run 
  inside the container.
  On the DEAs, these internal and external values are the same, but on Diego 
  Cells they may differ.
  
  `CF_INSTANCE_PORTS=[{external:61045,internal:5678},{external:61046,internal:2222}]`
  
  ### <a id='HOME'></a>HOME ###
  Root folder for the deployed application.
  
negative.code: ### <a id='PORT'></a>PORT ###
  
  The port on which the application should listen for requests.
  The Cloud Foundry runtime allocates a port dynamically for each instance of the
  application, so code that obtains or uses the application port should refer to
  it using the `PORT` environment variable.
  
  `PORT=61857`
  
  ### <a id='PWD'></a>PWD ###
  Identifies the present working directory, where the buildpack that processed
  the application ran.
  
  `PWD=/home/vcap/app`
  