Update README

README.md

@@ -14,7 +14,14 @@ packages:
 
 Note: we no longer include `spark_utils` in this package to avoid versioning conflicts. If you are running this package on non-core (Snowflake, BigQuery, Redshift, Postgres) platforms, you will need to use a package like `spark_utils` to shim macros.
 
-For example, in `dbt_project.yml`:
+For example, in `packages.yml`, you will need to include the relevant package:
+
+```yaml
+  - package: fishtown-analytics/spark_utils
+    version: <latest or range>
+```
+
+And reference in the dispatch list for `dbt_utils` in `dbt_project.yml`:
 ```yaml
 vars:
     dbt_utils_dispatch_list: [spark_utils]