diff --git a/helper/import_beancount.py b/helper/import_beancount.py
index 4429186..417d0fd 100755
--- a/helper/import_beancount.py
+++ b/helper/import_beancount.py
@@ -2,6 +2,18 @@
 """
 Beancount to Castle Import Script
 
+⚠️  NOTE: This script is for ONE-OFF MIGRATION purposes only.
+
+    Now that Castle uses Fava/Beancount as the single source of truth,
+    the data flow is: Castle → Fava/Beancount (not the reverse).
+
+    This script was used for initial data import from existing Beancount files.
+
+    Future disposition:
+    - DELETE if no longer needed for migrations
+    - REPURPOSE for bidirectional sync if that becomes a requirement
+    - ARCHIVE to misc-docs/old-helpers/ if keeping for reference
+
 Imports Beancount ledger transactions into Castle accounting extension.
 Reads daily BTC/EUR rates from btc_eur_rates.csv in the same directory.