Fix introductory sentence.
diff --git a/Doc/library/getopt.rst b/Doc/library/getopt.rst
index 088e1fa..31bd911 100644
--- a/Doc/library/getopt.rst
+++ b/Doc/library/getopt.rst
@@ -11,7 +11,7 @@
It supports the same conventions as the Unix :cfunc:`getopt` function (including
the special meanings of arguments of the form '``-``' and '``--``'). Long
options similar to those supported by GNU software may be used as well via an
-optional third argument. This module provides a single function and an
+optional third argument. This module provides two functions and an
exception: