diff --git a/src/main/lemondronor/advisorycircular.cljs b/src/main/lemondronor/advisorycircular.cljs
index aec3925..fc89367 100644
--- a/src/main/lemondronor/advisorycircular.cljs
+++ b/src/main/lemondronor/advisorycircular.cljs
@@ -116,6 +116,7 @@
                     "dist" (.toFixed radius-nm (if rapid-api? 0 1))]
                    (map str)
                    (string/join "/"))
+              ;; RapidAPI expects a trailing slash.
               (if rapid-api? "/" ""))
         headers (cond-> (if rapid-api? 
                           {:x-rapidapi-key api-key :x-rapidapi-host (:host (c-url/url url)) :useQueryString true}