diff --git a/darkseid/metadata.py b/darkseid/metadata.py
index 98a5d71..46e16ea 100644
--- a/darkseid/metadata.py
+++ b/darkseid/metadata.py
@@ -15,7 +15,7 @@
 from typing import TYPE_CHECKING, TypedDict
 
 if TYPE_CHECKING:
-    from datetime import date
+    from datetime import date, datetime
     from decimal import Decimal
 
 
@@ -541,6 +541,8 @@ class Metadata:
     tags: list[Basic] = field(default_factory=list)
     pages: list[ImageMetadata] = field(default_factory=list)
 
+    modified: datetime | None = None
+
     def __post_init__(self: Metadata) -> None:
         """
         Executes the post-initialization process for a Metadata instance.