diff --git a/js/common/model/CalculusGrapherModel.ts b/js/common/model/CalculusGrapherModel.ts
index 13d38182..34a72dd4 100644
--- a/js/common/model/CalculusGrapherModel.ts
+++ b/js/common/model/CalculusGrapherModel.ts
@@ -85,7 +85,7 @@ export default class CalculusGrapherModel implements TModel {
   // derived curves.
   public readonly predictCurve: TransformedCurve;
 
-  // These curves are derived from originalCurve.
+  // These curves are derived, not manipulated by the user.
   public readonly derivativeCurve: DerivativeCurve;
   public readonly integralCurve: IntegralCurve;
   public readonly secondDerivativeCurve: DerivativeCurve;