Sync of usage message text.

misc-scripts/binary_delta/apply.README

@@ -65,7 +65,8 @@ Usage
                 Default: "."
         -d path Path to the directory holding the old version of the
                 database, and where the new version of the database
-                should be created.
+                should be created.  The new database directory will be
+                given a unique name.
                 Default: "."
 
     Assuming the  current directory  holds a sub-directory  containing the