add comment

src/main/java/org/matsim/prepare/commercial/DefaultDemandPerDayCalculator.java

@@ -31,6 +31,12 @@ public int calculateKilogramsPerDay(double tonsPerYear) {
         return (int) kilogramsPerDay;
     }
 
+    /**
+     * Calculate the waste demand per day. The assumption is that waste is collected once a week and is collected in 20% of the zones on each day.
+     *
+     * @param freightDemandDataRelation the freight demand data relation
+     * @return the waste demand per day
+     */
     @Override
     public int calculateWasteDemandPerDay(Person freightDemandDataRelation) {
         String destination = CommercialTrafficUtils.getDestinationLocationId(freightDemandDataRelation);
@@ -55,7 +61,7 @@ public int calculateWasteDemandPerDay(Person freightDemandDataRelation) {
     }
 
     /**
-     * @param parcelsPerYear the number of parcels per year
+     * @param parcelsPerYear the number of parcels per year. This demand calculation contains no sampling. This results in a 100% demand.
      * @return the number of parcels per day
      */
     @Override

src/main/java/org/matsim/prepare/commercial/LTLFreightAgentGeneratorRuhr.java

@@ -330,6 +330,7 @@ private void addShipment(Network filteredNetwork, Carrier existingCarrier, Perso
                              Id<Link> toLinkId) {
         CarrierShipment newCarrierShipment;
 
+        // parcel delivery or general goods
         if (toLinkId == null) {
             Link toLink = NetworkUtils.getNearestLink(filteredNetwork, new Coord(CommercialTrafficUtils.getDestinationX(freightDemandDataRelation),
                     CommercialTrafficUtils.getDestinationY(freightDemandDataRelation)));