diff --git a/models.py b/models.py
index bd73c60..0e44d72 100644
--- a/models.py
+++ b/models.py
@@ -18,6 +18,7 @@ class Book(Base):
     id: Mapped[int] = mapped_column(primary_key=True, index=True)
     title: Mapped[str] = mapped_column(String(255), index=True)
     author: Mapped[str] = mapped_column(String(255))
+    publisher: Mapped[str] = mapped_column(String(255), nullable-False)
 
 # Pydantic models
 class BookIn(BaseModel):