DOCSP-45442 (#621)

Author: sonderdonk-mdb

source/reference/cutover-process.txt

@@ -75,6 +75,8 @@ Steps
 
    .. step:: Stop any write operations to the synced collections on the source.
 
+      - Wait for all transactions on the source cluster to either commit or 
+        abort.
       - ``mongosync`` enables destination-only write-blocking by default. 
         You can explicitly enable it by starting ``mongosync`` with
         ``enableUserWriteBlocking`` set to ``"destinationOnly"``.