diff --git a/app/api_types.ts b/app/api_types.ts
index dd8ffd1652b6e8bd5b34c1dabb593938c895928b..5c4d1b0787d0e891701767979301ad232983d1bd 100644
--- a/app/api_types.ts
+++ b/app/api_types.ts
@@ -38,5 +38,5 @@ export enum ApiRoutes {
 export enum ApiDefaults {
   CITY = "ALL_CITIES",
   MIN_RADIUS = 5,
-  MAX_RADIUS = 50,
+  MAX_RADIUS = 50, // The largest radius in kilometers that the Voltastics API is capable of handling.
 }