diff --git a/models/message.py b/models/message.py
index 48490c2..5f4a28d 100644
--- a/models/message.py
+++ b/models/message.py
@@ -8,8 +8,8 @@ class Message(Base):
     __tablename__ = "messages"
     
     id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
-    sender_id = Column(String, ForeignKey("users.id"), nullable=False)
-    recipient_id = Column(String, ForeignKey("users.id"), nullable=False)
+    sender_id = Column(String, ForeignKey("users.id"), nullable=False, index=True)
+    recipient_id = Column(String, ForeignKey("users.id"), nullable=False, index=True)
     content = Column(String, nullable=False)
     is_read = Column(Boolean, default=False)