Add :term:s for iterator.
diff --git a/Doc/howto/functional.rst b/Doc/howto/functional.rst
index b0739c7..a7b53db 100644
--- a/Doc/howto/functional.rst
+++ b/Doc/howto/functional.rst
@@ -13,7 +13,7 @@
In this document, we'll take a tour of Python's features suitable for
implementing programs in a functional style. After an introduction to the
concepts of functional programming, we'll look at language features such as
-iterators and :term:`generator`\s and relevant library modules such as
+:term:`iterator`\s and :term:`generator`\s and relevant library modules such as
:mod:`itertools` and :mod:`functools`.