diff --git a/src/renderer/plugins/markdown-macro.ts b/src/renderer/plugins/markdown-macro.ts
index 54c4b5d1..44c172c6 100644
--- a/src/renderer/plugins/markdown-macro.ts
+++ b/src/renderer/plugins/markdown-macro.ts
@@ -2,7 +2,6 @@ import { escapeRegExp, merge, omit } from 'lodash-es'
 import frontMatter from 'front-matter'
 import type { Plugin } from '@fe/context'
 import type { BuildInSettings, Doc } from '@fe/types'
-import { MARKDOWN_FILE_EXT } from '@share/misc'
 import type { MenuItem } from '@fe/services/status-bar'
 import { render } from '@fe/services/view'
 import { t } from '@fe/services/i18n'
@@ -10,6 +9,7 @@ import { readFile } from '@fe/support/api'
 import { getLogger, md5 } from '@fe/utils'
 import { basename, dirname, resolve } from '@fe/utils/path'
 import { getPurchased } from '@fe/others/premium'
+import { isPlain } from '@fe/services/document'
 import ctx from '@fe/context'
 
 type Result = { __macroResult: true, vars?: Record<string, any>, value: string }
@@ -208,8 +208,8 @@ async function include (
     return { __macroResult: true, value: 'Error: $include maximum call stack size exceeded [3]' }
   }
 
-  if (!path.endsWith(MARKDOWN_FILE_EXT)) {
-    return { __macroResult: true, value: 'Error: $include markdown file only' }
+  if (!isPlain({ type: 'file', path })) {
+    return { __macroResult: true, value: 'Error: $include path is not a plain file' }
   }
 
   try {
diff --git a/src/renderer/services/document.ts b/src/renderer/services/document.ts
index 2aab1829..61ce831b 100644
--- a/src/renderer/services/document.ts
+++ b/src/renderer/services/document.ts
@@ -166,7 +166,7 @@ export function isEncrypted (doc?: Pick<Doc, 'path' | 'type'> | null): boolean {
  * @param doc
  * @returns
  */
-export function isPlain (doc?: PathItemWithType) {
+export function isPlain (doc?: Omit<PathItemWithType, 'repo'>) {
   if (!doc) return false
 
   return doc.type === 'file' &&