diff --git a/plan.py b/plan.py
index aa66ba2..3d62700 100755
--- a/plan.py
+++ b/plan.py
@@ -84,8 +84,8 @@ def main():
     # highest conveyor belt capacity.
     for name, rate in required_items.items():
         print(name, rate, float(rate * 60))
-        if rate * 60 > 780:
-            print("Rate exceeds mk5 conveyor")
+        if rate * 60 > conveyor_rates[-1]:
+            print("Rate exceeds max conveyor")
 
     # Calculate the number of machines required to build each item at the
     # calculated rates.