updated docs & changelog
diff --git a/system/helpers/date_helper.php b/system/helpers/date_helper.php
index e792ecc..2ad287b 100644
--- a/system/helpers/date_helper.php
+++ b/system/helpers/date_helper.php
@@ -159,7 +159,8 @@
  * @access	public
  * @param	integer	a number of seconds
  * @param	integer	Unix timestamp
- * @return	integer
+ * @param	integer	a number of display units
+ * @return	string
  */
 if ( ! function_exists('timespan'))
 {