Bad docs for redirect_load_by_source()

Function redirect_load_by_source returns object, but behind the function is written it returns array of objects:

/**
 * Load multiple URL redirects from the database by {redirect}.source.
 *
 * @param $source
 *   The source of the URL redirect.
 *
 * @return
 *   An array of URL redirect objects indexed by redirect IDs.
 *
 * @see redirect_load_multiple()
 * @see _redirect_uasort()
 * @see redirect_compare_array_recursive()
 *
 * @ingroup redirect_api
 */

And other arguments than $source are not documented yet.