diff --git a/plan.py b/plan.py
index ed696f9..0bfdadf 100755
--- a/plan.py
+++ b/plan.py
@@ -52,26 +52,33 @@ def basic_rate(recipe: Dict) -> fractions.Fraction:
         )
 
 
+# The number of items per minute that each tier of conveyor can carry
+conveyor_rates = [0, 60, 120, 270, 480, 780, 900]
+
+
 def main():
     recipes = satisfactory.Cookbook('data/recipes')
 
     required_items = collections.defaultdict(fractions.Fraction)
 
+    # Create a list of items we want to make
     #targets = [ 'supercomputer' ]
     targets = recipes.components()
 
-    target_name = 'supercomputer'
-    target = recipes[target_name]
-    target_recipe = target['recipes'][0]
-
+    # Create an initial name:rate request for all of the target items, then
+    # create a plan for their creation.
     remain = [{n: basic_rate(recipes[n]['recipes'][0]) for n in targets}]
     required_items = calculate_rates(recipes, remain)
 
+    # Note if any particular item is (in aggregate) going to exceed the
+    # highest conveyor belt capacity.
     for name, rate in required_items.items():
         print(name, rate, float(rate * 60))
         if rate * 60 > 780:
-            print("Rate exceeds mk4 conveyer")
+            print("Rate exceeds mk5 conveyor")
 
+    # Calculate the number of machines required to build each item at the
+    # calculated rates.
     def numberdict():
         return collections.defaultdict(int)
     required_machines = collections.defaultdict(numberdict)
@@ -90,6 +97,7 @@ def main():
         machine = descriptor['machine']
         required_machines[machine][name] += requested_rate / normal_rate
 
+    # Calculate the power requirements for all the machines
     required_power = 0
 
     for machine, buckets in required_machines.items():