additional review

Author: jmd-mongo

source/reference/mongosync/mongosync-behavior.txt

@@ -381,16 +381,17 @@ Latency between ``mongosync`` and destination shards
   slower the sync.
 
 Latency between destination shards
-  Mongosync writes operations and updates its own metadata on the 
-  destination cluster in batches in a transaction. This can result in 
+  ``mongosync`` runs operations and updates its own metadata in batches 
+  in a transaction on the destination cluster. This can result in 
   cross-shard transactions, which may be more costly if the shards are 
   far apart.
 
-Latency between the nodes of each individual replica set on the source or destination
+Latency between the nodes of any replica set on the source or destination cluster
   ``mongosync`` uses :writeconcern:`"majority"` writes and 
   :readconcern:`"majority"` reads, which require acknowledgement from 
-  multiple nodes in a replica set. If the majority of these nodes aren't 
-  in the same region, there will be negative performance implications.
+  multiple nodes in a replica set, including shard-backing replica 
+  sets. If the majority of these nodes aren't in the same region, there 
+  will be negative performance implications.
 
 
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