add line on controlling syncs

Author: Amogh-Bharadwaj

docs/integrations/data-ingestion/clickpipes/postgres/schema-changes.md

@@ -13,3 +13,5 @@ ClickPipes for Postgres can detect schema changes in the source tables and, in s
 | Adding a new column (`ALTER TABLE ADD COLUMN ...`)                                  | Propagated automatically once the table gets an insert/update/delete. The new column(s) will be populated for all rows replicated after the schema change                                                   |
 | Adding a new column with a default value (`ALTER TABLE ADD COLUMN ... DEFAULT ...`) | Propagated automatically once the table gets an insert/update/delete. The new column(s) will be populated for all rows replicated after the schema change, but existing rows will not show the default value without a full table refresh |
 | Dropping an existing column (`ALTER TABLE DROP COLUMN ...`)                         | Detected, but **not** propagated. The dropped column(s) will be populated with `NULL` for all rows replicated after the schema change                                                                |
+
+Note that column addition will be propagated at the end of a batch's sync, which could occur after the sync interval or pull batch size is reached. More information on controlling syncs [here](./controlling_sync.md)