rawlinp commented on a change in pull request #1908: Changes for Backup Edge 
Cache Group
URL: 
https://github.com/apache/incubator-trafficcontrol/pull/1908#discussion_r170327632
 
 

 ##########
 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 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.  This backup list is ordered and if there 
are no caches available in any of the configured backup cache groups, the 
request will be bypassed (if configured) or rejected
 
 Review comment:
   question: did you build the docs with this change to make sure the 
`backupList` note is contained within the same box as the `coordinates` note? 
The syntax highlighting here makes me think that the 2nd note might not be in 
the same box

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