diff --git a/models/staging/stg_customers.yml b/models/staging/stg_customers.yml
index 3007d14..b2d6c25 100644
--- a/models/staging/stg_customers.yml
+++ b/models/staging/stg_customers.yml
@@ -1,6 +1,12 @@
 models:
   - name: stg_customers
-    description: Customer data with basic cleaning and transformation applied, one row per customer.
+    description: |
+      Customer data with basic cleaning and transformation applied, one row per customer.
+
+      Contains PII — downstream consumers must enforce access controls.
+    config:
+      tags: ["staging", "pii"]
+      deprecation_date: "2027-01-01"
     columns:
       - name: customer_id
         description: The unique key for each customer.