Update cdc.md (#52138)

docs/understanding-airbyte/cdc.md

@@ -24,6 +24,7 @@ We add some metadata columns for CDC sources which all begin with the `_ab_cdc_`
 - CDC incremental is only supported for tables with primary keys for most sources. A CDC source can still choose to replicate tables without primary keys as Full Refresh or a non-CDC source can be configured for the same database to replicate the tables without primary keys using standard incremental replication.
 - Data must be in tables, not views.
 - The modifications you are trying to capture must be made using `DELETE`/`INSERT`/`UPDATE`. For example, changes made from `TRUNCATE`/`ALTER` won't appear in logs and therefore in your destination.
+- Newly created tables/collections in your schema will cause the CDC snapshot to be ahead of what Airbyte has in the connection state. A refresh is required after any new table/collection is added.
 - There are database-specific limitations. See the documentation pages for individual connectors for more information.
 - The records produced by `DELETE` statements only contain primary keys. All other data fields are unset.
 - The final table will not show the records whose most recent entry has been deleted, as denoted by _ab_cdc_deleted_at.