diff --git a/doc/api/fs.md b/doc/api/fs.md
index 646d08a113383f..4f2535d6c3ba7a 100644
--- a/doc/api/fs.md
+++ b/doc/api/fs.md
@@ -2459,7 +2459,7 @@ changes:
 * `path` {string|Buffer|URL}
 * `options` {Object|integer}
   * `recursive` {boolean} **Default:** `false`
-  * `mode` {integer} Not supported on Windows. **Default:** `0o777`.
+  * `mode` {string|integer} Not supported on Windows. **Default:** `0o777`.
 * `callback` {Function}
   * `err` {Error}
 
@@ -2507,7 +2507,7 @@ changes:
 * `path` {string|Buffer|URL}
 * `options` {Object|integer}
   * `recursive` {boolean} **Default:** `false`
-  * `mode` {integer} Not supported on Windows. **Default:** `0o777`.
+  * `mode` {string|integer} Not supported on Windows. **Default:** `0o777`.
 
 Synchronously creates a directory. Returns `undefined`.
 This is the synchronous version of [`fs.mkdir()`][].
@@ -4819,7 +4819,7 @@ added: v10.0.0
 * `path` {string|Buffer|URL}
 * `options` {Object|integer}
   * `recursive` {boolean} **Default:** `false`
-  * `mode` {integer} Not supported on Windows. **Default:** `0o777`.
+  * `mode` {string|integer} Not supported on Windows. **Default:** `0o777`.
 * Returns: {Promise}
 
 Asynchronously creates a directory then resolves the `Promise` with no