edit

Author: Sam Kleinman

source/reference/command/replSetSyncFrom.txt

@@ -16,11 +16,11 @@ replSetSyncFrom
    which host the current :program:`mongod` will poll :term:`oplog`
    entries from. This operation may be useful for testing different
    patterns and in situations where a set member is not syncing from
-   the host you want. The member to sync from must be a valid sync 
-   source for data in the set; that is, it it cannot be:
+   the host you want. The member to sync from must be a valid 
+   source for data in the set; a member of a replica set cannot sync from:
 
-   - the node itself.
-   - an arbiter (arbiters have no data).
+   - itself.
+   - an arbiter, because arbiters do not hold data.
    - a member that does not build indexes.
    - an unreachable member.
    - a :program:`mongod` instance that is not a member of the same
@@ -54,7 +54,8 @@ replSetSyncFrom
 
       :dbcommand:`replSetSyncFrom` provides a temporary override of
       default behavior. When you restart the :program:`mongod`
-      instance, or if the sync's TCP connection flaps (resets), mongod 
-      will revert to its default logic for selecting a sync source.
+      instance, if the connection that the :program:`mongod` uses to
+      sync, the :program:`mongod` will revert to the default logic for
+      selecting a sync source.
 
    .. slave-ok, admin-only