diff --git a/packages/gatsby/src/utils/webpack-hmr-hooks-patch.js b/packages/gatsby/src/utils/webpack-hmr-hooks-patch.js
index 169718284d486..7aca2012242c2 100644
--- a/packages/gatsby/src/utils/webpack-hmr-hooks-patch.js
+++ b/packages/gatsby/src/utils/webpack-hmr-hooks-patch.js
@@ -1,3 +1,7 @@
+/**
+ * This file should remain as JS because the migration to TypeScript break the patch.
+ * For more details, https://github.com/gatsbyjs/gatsby/pull/22280
+ */
 const originalFetch = global.fetch
 delete global.fetch