diff --git a/doc/api/fs.md b/doc/api/fs.md
index d2081c43e97f7f..7ea6835387719b 100644
--- a/doc/api/fs.md
+++ b/doc/api/fs.md
@@ -2086,8 +2086,8 @@ changes:
 -->
 
 * `fd` {integer}
-* `atime` {integer}
-* `mtime` {integer}
+* `atime` {number|string|Date}
+* `mtime` {number|string|Date}
 
 Synchronous version of [`fs.futimes()`][]. Returns `undefined`.
 
@@ -3472,8 +3472,8 @@ changes:
 -->
 
 * `path` {string|Buffer|URL}
-* `atime` {integer}
-* `mtime` {integer}
+* `atime` {number|string|Date}
+* `mtime` {number|string|Date}
 
 Returns `undefined`.