builtin -> built-in.
diff --git a/Doc/library/configparser.rst b/Doc/library/configparser.rst
index 2eeefb0..ef27524 100644
--- a/Doc/library/configparser.rst
+++ b/Doc/library/configparser.rst
@@ -56,7 +56,7 @@
constructor as a dictionary. Additional defaults may be passed into the
:meth:`get` method which will override all others.
-Sections are normally stored in a builtin dictionary. An alternative dictionary
+Sections are normally stored in a built-in dictionary. An alternative dictionary
type can be passed to the :class:`ConfigParser` constructor. For example, if a
dictionary type is passed that sorts its keys, the sections will be sorted on
write-back, as will be the keys within each section.