diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index f4a54f4f5d6..d13fc3d9208 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -927,7 +927,7 @@ Notes:
    :ref:`faq-multidimensional-list`.
 
 (3)
-   If *i* or *j* is negative, the index is relative to the end of the string:
+   If *i* or *j* is negative, the index is relative to the end of sequence *s*:
    ``len(s) + i`` or ``len(s) + j`` is substituted.  But note that ``-0`` is
    still ``0``.