diff --git a/src/types/base.types.ts b/src/types/base.types.ts
index 318f8bc..07fd174 100644
--- a/src/types/base.types.ts
+++ b/src/types/base.types.ts
@@ -207,6 +207,6 @@ export enum ExerciseRouteResultType {
 }
 
 export interface ExerciseRoute {
-  type?: ExerciseRouteResultType; // Nullable for write-only, reads always populate this
+  type?: ExerciseRouteResultType; // ReadRecord(s) will always populate this, write and readExerciseRoute will not
   route: Location[];
 }