diff --git a/deno/types.ts b/deno/types.ts
index 767d03a..b98cd9e 100644
--- a/deno/types.ts
+++ b/deno/types.ts
@@ -3,6 +3,10 @@
 // FIXME: split this up into types used by app developers and types internal
 // to the framework.
 
+// FIXME: the use of types like Request and Response cause problems because it's
+// easy to forget to import them and then all sorts of random typechecking errors
+// start showing up even if the code is sound.  So find other names for them.
+
 import { z } from "zod";
 import { HttpCode, httpCodes } from "./http-codes.ts";
 import { ContentType, contentTypes } from "./content-types.ts";