diff --git a/README.md b/README.md
index d1014d1..6cc50c5 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ The **products** section describes all products and subproducts in the simulatio
 |`transportation cost`    | The cost (in dollars per km per tonnes) to transport this product. Must be a timeseries.
 |`initial amounts`        | A dictionary mapping the name of each location to its description (see below). If this product is not initially available, this key may be omitted. Must be a timeseries.
 
-Each product may have some amount available at the beginning of the simulation. In this case, the key `initial amounts` maps to a dictionary with the following keys:
+Each product may have some amount available at the beginning of each time period. In this case, the key `initial amounts` maps to a dictionary with the following keys:
 
 | Key                     | Description
 |:------------------------|---------------|
diff --git a/instances/s1.json b/instances/s1.json
index 5c9df2a..8f40f3c 100644
--- a/instances/s1.json
+++ b/instances/s1.json
@@ -126,7 +126,6 @@
                 "L4": {
                     "latitude": 0.75,
                     "longitude": 0.20,
-                    "processing cost": 250.0,
                     "opening cost": [3000, 3000],
                     "fixed operating cost": [50.0, 50.0],
                     "variable operating cost": [50.0, 50.0]