diff --git a/web/src/components/player/GenericVideoPlayer.tsx b/web/src/components/player/GenericVideoPlayer.tsx
index 6984b9270..cd6757f71 100644
--- a/web/src/components/player/GenericVideoPlayer.tsx
+++ b/web/src/components/player/GenericVideoPlayer.tsx
@@ -25,6 +25,8 @@ export function GenericVideoPlayer({
     const checkSourceExists = async (url: string) => {
       try {
         const response = await fetch(url, { method: "HEAD" });
+        // nginx vod module returns 502 for non existent media
+        // https://github.com/kaltura/nginx-vod-module/issues/468
         setSourceExists(response.status !== 502);
       } catch (error) {
         setSourceExists(false);