diff --git a/docsite/docusaurus.config.ts b/docsite/docusaurus.config.ts
index 9d9f24e9897a06..8201c2a24e4752 100644
--- a/docsite/docusaurus.config.ts
+++ b/docsite/docusaurus.config.ts
@@ -108,6 +108,7 @@ const config: Config = {
     prism: {
       theme: prismThemes.vsLight,
       darkTheme: prismThemes.vsDark,
+      additionalLanguages: ['diff'],
     },
   } satisfies Preset.ThemeConfig,
 };