diff --git a/transport-interop/impl/js/v2.x/test/fixtures/relay.ts b/transport-interop/impl/js/v2.x/test/fixtures/relay.ts
index 9fb688773..2222e3220 100644
--- a/transport-interop/impl/js/v2.x/test/fixtures/relay.ts
+++ b/transport-interop/impl/js/v2.x/test/fixtures/relay.ts
@@ -32,3 +32,6 @@ export async function createRelay (): Promise<Libp2p> {
 
   return server
 }
+
+// why is this comment necessary?
+// it seems to bust a mystery cache used by CI