diff --git a/src/main.py b/src/main.py
index bfe3a86..d2bc31e 100644
--- a/src/main.py
+++ b/src/main.py
@@ -5,6 +5,7 @@
 
 
 def validorder(order: Order):
+    """Check if the order is valid."""
     net = 0
 
     for item in order.items: