diff --git a/app/models/document.py b/app/models/document.py
index 91f8fe2..740f57a 100644
--- a/app/models/document.py
+++ b/app/models/document.py
@@ -1,6 +1,6 @@
 from datetime import datetime
 
-from sqlalchemy import Boolean, DateTime, Integer, String, Text
+from sqlalchemy import Boolean, DateTime, Integer, String, Text, JSON
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.db.base import Base
@@ -30,6 +30,10 @@ class Document(Base):
     file_size: Mapped[int | None] = mapped_column(Integer, nullable=True)
     page_count: Mapped[int | None] = mapped_column(Integer, nullable=True)
 
+    # Future-ready metadata for normalized sources, such as:
+    # image -> letter PDF, image -> A4 PDF, receipt roll normalization, etc.
+    normalization_json: Mapped[dict | None] = mapped_column(JSON, nullable=True)
+
     sha256_original: Mapped[str | None] = mapped_column(String(64), nullable=True)
     sha256_current: Mapped[str | None] = mapped_column(String(64), nullable=True)