diff --git a/vrobbler/apps/scrobbles/dataclasses.py b/vrobbler/apps/scrobbles/dataclasses.py
index aa2dcbf..6976a78 100644
--- a/vrobbler/apps/scrobbles/dataclasses.py
+++ b/vrobbler/apps/scrobbles/dataclasses.py
@@ -135,6 +135,7 @@ class BookLogData(LongPlayLogData):
     page_start: Optional[int] = None
     page_end: Optional[int] = None
     serial_scrobble_id: Optional[int] = None
+    details: Optional[str] = None
 
 
 @dataclass