diff --git a/doc/api/fs.md b/doc/api/fs.md
index afae9ca66488e8..d20024419cb247 100644
--- a/doc/api/fs.md
+++ b/doc/api/fs.md
@@ -503,7 +503,9 @@ default value of 64 kb for the same parameter.
 
 `options` can include `start` and `end` values to read a range of bytes from
 the file instead of the entire file.  Both `start` and `end` are inclusive and
-start at 0. The `encoding` can be any one of those accepted by [`Buffer`][].
+start counting at 0. If `fd` is specified and `start` is omitted or `undefined`,
+`fs.createReadStream()` reads sequentially from the current file position.
+The `encoding` can be any one of those accepted by [`Buffer`][].
 
 If `fd` is specified, `ReadStream` will ignore the `path` argument and will use
 the specified file descriptor. This means that no `'open'` event will be emitted.