diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b27388c5..bace28d0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -263,7 +263,7 @@ if (!result.response.ok) {
 return { person: result.data! }; // non-null assertion is safe after the ok check
 ```
 
-For multipart/form-data (file uploads): bypass the typed client and use raw `fetch` — the client cannot handle it.
+For multipart/form-data (file uploads): bypass the typed client and use `event.fetch` directly — never global `fetch`. The typed client cannot handle multipart bodies, but `event.fetch` is still required so that `handleFetch` injects the session cookie.
 
 ### Date handling