diff --git a/plugins/destination/bigquery/docs/_configuration.md b/plugins/destination/bigquery/docs/_configuration.md
index 6a9d73c1b7fdba..35d6dc967b2950 100644
--- a/plugins/destination/bigquery/docs/_configuration.md
+++ b/plugins/destination/bigquery/docs/_configuration.md
@@ -12,8 +12,7 @@ spec:
     project_id: ${PROJECT_ID}
     dataset_id: ${DATASET_ID}
     # Optional parameters
-    # service_account_key_json: |-
-    #   ${SERVICE_ACCOUNT_KEY_JSON} # GCP service account key, expressed as JSON, can be placed in the SERVICE_ACCOUNT_KEY_JSON env var and referenced with this syntax.
+    # service_account_key_json: ${file:./path-to-your-file.json} # GCP service account key, can be placed in a file and referenced with this syntax.
     # dataset_location: ""
     # time_partitioning: none # options: "none", "hour", "day", "month", "year"
     # time_partitioning_expiration: 0 # duration, e.g. "24h" or "720h" (30 days)