diff --git a/app/api/v1/models.py b/app/api/v1/models.py
index 6e5f458..56d238b 100644
--- a/app/api/v1/models.py
+++ b/app/api/v1/models.py
@@ -4,6 +4,7 @@
 
 
 class Airport(Base):
+    # Schema: https://openflights.org/data.php#airport
     __tablename__ = 'airport'
 
     id: int = Column(Integer, primary_key=True, autoincrement=True)