diff --git a/src/logic/dataclass.py b/src/logic/dataclass.py
index f32f37b..f7f51a1 100644
--- a/src/logic/dataclass.py
+++ b/src/logic/dataclass.py
@@ -76,6 +76,7 @@ class BookData:
     pages: str | None = None
     library_location: int | None = None
     in_apparat: bool | None = False
+    adis_idn: str | None = None
 
     def from_dict(self, data: dict):
         for key, value in data.items():