diff --git a/cloud-operations/scheduled-asset-inventory-export-bq/README.md b/cloud-operations/scheduled-asset-inventory-export-bq/README.md
index ef8bca88..69c6e589 100644
--- a/cloud-operations/scheduled-asset-inventory-export-bq/README.md
+++ b/cloud-operations/scheduled-asset-inventory-export-bq/README.md
@@ -38,17 +38,29 @@ Once resources are created, you can run queries on the data you exported on Bigq
 
 You can also create a dashboard connecting [Datalab](https://datastudio.google.com/) or any other BI tools of your choice to your Bigquery datase.
 
+## File exporter for JSON, CSV. 
+
+Regular file-based exports of Cloud Asset Inventory may be useful for scale-out network dependency discovery like [Planet Exporter](https://github.com/williamchanrico/planet-exporter) or to update asset tracking or configuration management workflows. Bigquery supports multiple [export formats](https://cloud.google.com/bigquery/docs/exporting-data#export_formats_and_compression_types) and one may upload objects to Storage Bucket using provided Cloud Function. Specify `job.DestinationFormat` as defined in [documentation](https://googleapis.dev/python/bigquery/latest/generated/google.cloud.bigquery.job.DestinationFormat.html), e.g. `NEWLINE_DELIMITED_JSON`.
+
+It helps to create custom [scheduled query](https://cloud.google.com/bigquery/docs/scheduling-queries#console) for to comply with downstream systems' fields, and to time it with CAI export into BQ for freshness. See [sample queries](https://cloud.google.com/asset-inventory/docs/exporting-to-bigquery-sample-queries).
+
+Note: Cloud Function's Service Account needs write-capable IAM role on `bucket`.
+
+
 <!-- BEGIN TFDOC -->
 ## Variables
 
 | name | description | type | required | default |
 |---|---|:---: |:---:|:---:|
-| cai_config | Cloud Asset inventory export config. | <code title="object&#40;&#123;&#10;bq_dataset  &#61; string&#10;bq_table    &#61; string&#10;target_node &#61; string&#10;&#125;&#41;">object({...})</code> | ✓ |  |
+| cai_config | Cloud Asset Inventory export config. | <code title="object&#40;&#123;&#10;bq_dataset         &#61; string&#10;bq_table           &#61; string&#10;bq_table_overwrite &#61; bool&#10;target_node        &#61; string&#10;&#125;&#41;">object({...})</code> | ✓ |  |
 | project_id | Project id that references existing project. | <code title="">string</code> | ✓ |  |
 | *billing_account* | Billing account id used as default for new projects. | <code title="">string</code> |  | <code title="">null</code> |
 | *bundle_path* | Path used to write the intermediate Cloud Function code bundle. | <code title="">string</code> |  | <code title="">./bundle.zip</code> |
+| *bundle_path_cffile* | Path used to write the intermediate Cloud Function code bundle. | <code title="">string</code> |  | <code title="">./bundle_cffile.zip</code> |
+| *file_config* | Optional BQ table as a file export function config. | <code title="object&#40;&#123;&#10;bucket     &#61; string&#10;filename   &#61; string&#10;format     &#61; string&#10;bq_dataset &#61; string&#10;bq_table   &#61; string&#10;&#125;&#41;">object({...})</code> |  | <code title="&#123;&#10;bucket     &#61; null&#10;filename   &#61; null&#10;format     &#61; null&#10;bq_dataset &#61; null&#10;bq_table   &#61; null&#10;&#125;">...</code> |
 | *location* | Appe Engine location used in the example. | <code title="">string</code> |  | <code title="">europe-west</code> |
 | *name* | Arbitrary string used to name created resources. | <code title="">string</code> |  | <code title="">asset-inventory</code> |
+| *name_cffile* | Arbitrary string used to name created resources. | <code title="">string</code> |  | <code title="">cffile-exporter</code> |
 | *project_create* | Create project instead ofusing an existing one. | <code title="">bool</code> |  | <code title="">true</code> |
 | *region* | Compute region used in the example. | <code title="">string</code> |  | <code title="">europe-west1</code> |
 | *root_node* | The resource name of the parent folder or organization for project creation, in 'folders/folder_id' or 'organizations/org_id' format. | <code title="">string</code> |  | <code title="">null</code> |
diff --git a/cloud-operations/scheduled-asset-inventory-export-bq/variables.tf b/cloud-operations/scheduled-asset-inventory-export-bq/variables.tf
index 83823b90..c2137d89 100644
--- a/cloud-operations/scheduled-asset-inventory-export-bq/variables.tf
+++ b/cloud-operations/scheduled-asset-inventory-export-bq/variables.tf
@@ -51,6 +51,13 @@ variable "file_config" {
     bq_dataset = string
     bq_table   = string
   })
+  default = {
+    bucket     = null
+    filename   = null
+    format     = null
+    bq_dataset = null
+    bq_table   = null
+  }
 }
 
 variable "location" {
diff --git a/tests/cloud_operations/scheduled_asset_inventory_export_bq/test_plan.py b/tests/cloud_operations/scheduled_asset_inventory_export_bq/test_plan.py
index f3d07509..484496a5 100644
--- a/tests/cloud_operations/scheduled_asset_inventory_export_bq/test_plan.py
+++ b/tests/cloud_operations/scheduled_asset_inventory_export_bq/test_plan.py
@@ -24,4 +24,4 @@ def test_resources(e2e_plan_runner):
   "Test that plan works and the numbers of resources is as expected."
   modules, resources = e2e_plan_runner(FIXTURES_DIR)
   assert len(modules) == 7
-  assert len(resources) == 28
+  assert len(resources) == 29