diff --git a/Qa/lib/validation/assert/other.php b/Qa/lib/validation/assert/other.php
index 6498c67f2..5a82f79ef 100644
--- a/Qa/lib/validation/assert/other.php
+++ b/Qa/lib/validation/assert/other.php
@@ -42,11 +42,9 @@ function df_assert_sne(string $v, int $sl = 0):string {
 /**
  * 2016-08-09
  * @used-by dfaf()
- * @param Traversable|array $v
  * @param string|Th $m [optional]
- * @return Traversable|array
  * @throws DFE
  */
-function df_assert_traversable($v, $m = null) {return is_iterable($v) ? $v : df_error($m ?:
+function df_assert_traversable(iterable $v, $m = null):iterable {return is_iterable($v) ? $v : df_error($m ?:
 	'A variable is expected to be a Traversable or an array, ' . 'but actually it is %s.', df_type($v)
 );}
\ No newline at end of file