wording

Author: mindyk

source/use-cases/storing-comments.txt

@@ -340,7 +340,7 @@ sub-comments, which can intern hold sub-comments.
    comments *except* as you store them in MongoDB.
 
    If, in the future, you want to switch from chronological to
-   threaded or from chronological to threaded, this design would make
+   threaded or from threaded to chronological, this design would make
    that migration quite expensive.
 
 .. warning::