fix wording

docs/src/main/paradox/migration-guide.md

@@ -14,15 +14,15 @@ DROP CONSTRAINT durable_state_pkey,
 ADD PRIMARY KEY(persistence_id);
 ```
 
-Same goes for the (optional) index `` used for slice base queries. To remove the column from the index, use:
+Same goes for the (optional) index `durable_state_slice_idx` used for slice base queries. To remove the column from the index, use:
 
 Postgres / Yugabyte:
 : ```sql
 DROP INDEX IF EXISTS durable_state_slice_idx;
 CREATE INDEX IF NOT EXISTS durable_state_slice_idx ON durable_state(slice, entity_type, db_timestamp);
 ```
 
-Changes to the database schema like mentioned above can have an impact on the availability of the database under certain conditions.
+As mentioned above, this is optional. Changes to the database schema like this one can have an impact on the availability of the database under certain conditions.
 
 Make sure to test them on a copy of your database to learn more about the potential impact.