diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf53e23bfa..427eec6a91 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Svelte changelog
 
+## Unreleased
+
+* Hide private preprocess typings ([#6622](https://github.com/sveltejs/svelte/issues/6622))
+
 ## 3.42.5
 
 * In `draw` transition, account for `stroke-linecap` in determining length ([#4540](https://github.com/sveltejs/svelte/issues/4540))
diff --git a/src/compiler/preprocess/types.ts b/src/compiler/preprocess/types.ts
index 94007371cc..4ac441b5e6 100644
--- a/src/compiler/preprocess/types.ts
+++ b/src/compiler/preprocess/types.ts
@@ -1,5 +1,8 @@
 import { Location } from 'locate-character';
 
+/**
+ * @internal
+ */
 export interface Source {
 	source: string;
 	get_location: (search: number) => Location;