Update SYNC_MODE.md

docs/SYNC_MODE.md

@@ -39,7 +39,7 @@ Taps should allow users to choose which streams and fields to replicate. The fol
 | `selected-by-default` | Only applies to fields.  If there is no `selected` metadata for a  field, this can be set to `True` or `False` to set a default behavior. Can be written by a tap during discovery |
 
 ### Legacy Stream/Field Selection
-Some legacy Taps handle stream and field selection by looking for `"selected": true` directly in the stream's schema (or properties.json).
+Some legacy Taps handle stream and field selection by looking for `"selected": true` directly in the stream's schema in the catalog.json file (or properties.json).
 
 #### Example of legacy Stream/Field Selection
 Here is an example catalog with a selected stream that has two fields selected and one field unselected
@@ -129,4 +129,4 @@ INFO METRIC: {"type": "counter", "metric": "record_count", "value": 14, "tags":
 
 ```
 
-> We fetched a total of 314 records from an "orders" endpoint.
+> We fetched a total of 314 records from an "orders" endpoint.