diff --git a/src/dlsite_async/work.py b/src/dlsite_async/work.py
index 46ae0d1..81d0bc5 100644
--- a/src/dlsite_async/work.py
+++ b/src/dlsite_async/work.py
@@ -86,6 +86,8 @@ class Work:
     page_count: Optional[int] = None
     description: Optional[str] = None
     sample_images: Optional[list[str]] = None
+    title_name: Optional[str] = None
+    title_id: Optional[str] = None
 
     @classmethod
     def from_dict(cls, d: Mapping[str, Any]) -> "Work":