diff --git a/src/shared/shared.ts b/src/shared/shared.ts
index 64d78615..c6bbf68d 100644
--- a/src/shared/shared.ts
+++ b/src/shared/shared.ts
@@ -9,7 +9,7 @@ export type {
   DefaultTheme
 } from '../../types/shared'
 
-export const EXTERNAL_URL_RE = /^https?:/i
+export const EXTERNAL_URL_RE = /^https?:|\.(?!html|md)\w+$/i
 
 // @ts-ignore
 export const inBrowser = typeof window !== 'undefined'