limited commented on a change in pull request #1908: Changes for Backup Edge 
Cache Group
URL: 
https://github.com/apache/incubator-trafficcontrol/pull/1908#discussion_r170248094
 
 

 ##########
 File path: docs/source/admin/traffic_ops/using.rst
 ##########
 @@ -881,7 +892,9 @@ The CZF is an input to the Traffic Control CDN, and as 
such does not get generat
 
 The script that generates the CZF file is not part of Traffic Control, since 
it is different for each situation.
 
-.. note:: The ``"coordinates"`` section is optional and may be used by Traffic 
Router for localization in the case of a CZF "hit" where the zone name does not 
map to a Cache Group name in Traffic Ops (i.e. Traffic Router will route to the 
closest Cache Group(s) geographically).
+.. note:: The ``"coordinates"`` section is optional and may be used by Traffic 
Router for localization in the case of a CZF "hit" where the zone name does not 
map to a Cache Group name in Traffic Ops (i.e. Traffic Router will route to the 
closest Cache Group(s) geographically).  
+
+The ``"backupList"`` section is optional and may be used by Traffic Router for 
localization in the case of a CZF "hit" where the zone name does not map to a 
Cache Group name in Traffic Ops (i.e. Traffic Router will route to the 
configured backup Cache Group(s)). This can be used as an alternative to 
``"coordinates"`` therby enabling operators to have a control over choosing 
back up edge servers rather than depending on Geo-coordinates based routing.
 
 Review comment:
   "where zone name does not map to a cg name in Traffic Ops"
   
   This might be more clearly written as:
   ```
   The ``"backupList"`` section is optional and is used by Traffic Router for 
localization in the case of a CZF
    "hit" when there are no caches available for that DS in the matched cache 
group. 
   ```

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