diff --git a/.changeset/curvy-chefs-design.md b/.changeset/curvy-chefs-design.md
new file mode 100644
index 000000000000..4a4d97743d03
--- /dev/null
+++ b/.changeset/curvy-chefs-design.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+docs: explain how to add ambient typings
diff --git a/packages/kit/types/ambient.d.ts b/packages/kit/types/ambient.d.ts
index f781c274dcaa..d4ed8951b6b4 100644
--- a/packages/kit/types/ambient.d.ts
+++ b/packages/kit/types/ambient.d.ts
@@ -11,9 +11,12 @@
  * 	}
  * }
  *
- * export default undefined;
+ * export {};
  * ```
  *
+ * The `export {}` line exists because without it, the file would be treated as an _ambient module_ which prevents you from adding `import` declarations.
+ * If you need to add ambient `declare module` declarations, do so in a separate file like `src/ambient.d.ts`.
+ *
  * By populating these interfaces, you will gain type safety when using `event.locals`, `event.platform`, and `data` from `load` functions.
  */
 declare namespace App {